Term
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Definition
composed of the brain and spinal cord |
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Term
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Definition
Elaboration of the anterior portion of the CNS INcrease in number of neurons in the head Highest level is reached in the human brain |
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Term
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Definition
Cerebral hemispheres, cerebellum, and brain stem |
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Term
Adult brain structures: secondary brain vesicles |
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Definition
Telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon |
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Term
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Definition
cerebrum: cortex, white matter, and basal nuclei |
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Definition
thalamus, hypothalamus, and epithalamus |
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Definition
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Definition
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Definition
brainstem: medulla oblongata |
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Definition
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Definition
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Definition
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Definition
metencephalon and myelencephalon |
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Term
Basic pattern: Spinal Cord |
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Definition
Central cavity surround by a gray matter core. External to which is white matter composed of myelinated fiber tracts |
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Term
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Definition
Similar to spinal cord but with additional areas of gray matter Cerebellum has gray matter in nuclei Cerebrum has nuclei and additional gray matter in cortex |
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Definition
Arise from expansion of the lumen of the neural tube |
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Term
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Definition
Form the superior part of the brain and make up 83% of its mass Contains ridges (gyri) and shallow grooves (sulci) Contains deep grooves called fissures |
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Term
What divides the cerebral hemispheres? |
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Definition
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Term
Three regions of the Cerebral hemispheres |
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Definition
cortex, white matter, and basal nuclei |
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Term
Major lobes of the Cerebral Hemisphere |
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Definition
Frontal, parietal, temporal, occipital, and insula (internal) |
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Term
Major Sulci of the Cerebral Hemisphere |
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Definition
Central, Parieto-occipital, Lateral |
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Term
Major gyri of the Cerebral Hemisphere |
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Definition
Precentral and postcentral gyri |
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Term
Precentral and postcentral gyri: location |
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Definition
border the central sulcus |
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Term
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Definition
separates the frontal and parietal lobe |
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Term
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Definition
separates the parietal and occipital lobes |
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Term
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Definition
separates the parietal and temporal lobes |
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Term
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Definition
superficial gray matter; accounts for 40% of the mass of the brain Enables sensation, communication, memory, understanding, and voluntary movements |
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Term
Cerebral cortex: Hemispheres |
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Definition
Each acts contralaterally (controls the opposite side of the body) Are not equal in function |
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Term
Cerebral cortex: Functional areas |
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Definition
No singular one acts alone; conscious behavior involves the entire cortex |
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Term
Functional areas of the Cerebral Cortex: 3 types |
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Definition
Motor, Sensory, Association |
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Term
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Definition
control voluntary movement |
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Term
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Definition
conscious awareness of sensation |
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Term
Functional Association areas |
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Definition
integrate diverse information |
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Term
Cerebral Cortex: Motor Areas |
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Definition
Primary (somatic) motor cortex, premotor cortex, Broca's area, Frontal eye field |
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Term
Primary (somatic) motor cortex |
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Definition
Located in the precental gyrus Pyramidal cells whose axons make up the corticospinal tracts Allows conscious control of precise, skilled, voluntary movements |
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Term
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Definition
Located anterior the the precentral gyrus. Controls learned, repetitious, or patterned motor skills. Coordinates simultaneous or sequential actions. Involved in the planning of movements. |
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Term
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Definition
Located anterior to the inferior region of the premotor area. Present in one hemisphere (usually left). A motor speech area that directs muscles of the tongue. Is active as on prepares to speak |
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Term
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Definition
located anterior the premotor cortex and superior to Broca's area. Controls voluntary eye movemnt |
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Term
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Definition
Primary somatosensory cortex, somatosensory association cortex, visual and auditory areas, olfactory, gustatory, and vestibular cortices |
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Term
Primary Somatosensory cortex |
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Definition
Located in the post central gyrus Receives information from the skin and skeletal muscles Exhibits spatial discrimination |
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Term
Somatosensory Association Cortex |
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Definition
Located posterior to the primary somatosensory cortex Integrates sensory information Forms comprehensive understanding of the stimulus Determines size, texture, and relationship of parts |
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Term
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Definition
Primary visual (striate) cortex, Visual association area |
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Term
Primary visual (striate) cortex |
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Definition
Seen on the extreme posterior tip of the occipital lobe. Most of it is buried in the calcarine sulcus. Receives visual information form the retinas |
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Term
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Definition
Surrounds the primary visual cortex Interprets visual stimuli (color, form, and movement) |
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Term
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Definition
Primary auditory cortex, Auditory association area |
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Term
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Definition
Located at the superior margin of the temporal lobe. Receives information related to pitch, rhythm, and loudness |
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Term
Auditory association area |
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Definition
Located posterior to the primary auditory cortex, stores memories of sounds and permits perception of sounds. Wernicke's area |
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Term
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Definition
Prefrontal cortex, language areas, general (common) interpretation area, visceral association area |
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Term
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Definition
Located in the anterior portion of the frontal lobe. Involved with intellect cognition, recall, and personality. Necessary for judgement, reasoning, persistence, and conscience. Closely linked to the limbic system (emotional part of the brain) |
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Term
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Definition
Located in a large area surrounding the left (or language-domniant) lateral sulcus |
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Term
Major parts of Language Areas |
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Definition
Wernicke's Area, Broca's area, Lateral prefrontal cortex, Lateral and ventral temporal lobe |
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Term
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Definition
sounding out unfamiliar words |
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Term
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Definition
speech preparation and production |
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Term
Lateral prefrontal cortex |
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Definition
language comprehension and word analysis |
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Term
Lateral and ventral temporal lobe |
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Definition
coordinate auditory and visual aspects of language |
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Term
Visceral association area |
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Definition
Located in the cortex of the insula. Involved in conscious perception of visceral sensations |
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Term
Lateralization of Cortical Function |
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Definition
Lateralization, Cerebral dominance, Left hemisphere, right hemisphere |
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Term
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Definition
each hemisphere has abilities not shared with its partner |
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Term
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Definition
designates the hemisphere dominant for language |
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Term
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Definition
controls language, math, and logic |
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Term
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Definition
controls visual-spatial skills, emotion, and artistic skills |
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Term
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Definition
Consists of deep myelinated fibers and their tracts. Responsible for communication between the cerebral cortex and lower CNS center, and areas of the Cerebrum |
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Term
Cerebral White Matter types |
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Definition
Commissures, Association fibers, Projection fibers |
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Term
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Definition
connect corresponding gray areas of the two hemisphers |
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Term
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Definition
connect different parts of the same hemisphere |
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Term
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Definition
enter the hemispheres from lower brain or cord centers |
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Term
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Definition
Central core of the forebrain. Encloses the third ventricle |
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Term
Diencephalon: consists of... |
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Definition
Three paired structures -thalamus, hypothalamus, and epithalamus |
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Term
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Definition
paired, egg-shaped masses that form the superolateral walls of the third ventricle. Connected at the midline by the intermediate mass. |
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Term
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Definition
Four groups: Anterior, ventral, dorsal, and posterior Project and receive fibers from the cerebral cortex |
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Term
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Definition
Sensual afferent impulses converge and synapse in the thalamus Impulses of similar function are sorted out, edited, and relayed as a group All inputs ascending to the cerebral cortex pass through the thalamus. Mediates sensation, motor activities, cortical arousal, learning, and memory |
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Term
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Definition
Located below the thalamus, it caps the brainstem and forms the inferolateral walls of the third ventricle |
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Term
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Definition
Small, paired nuclei bulging anteriorly from the hypothalamus. Relay station for olfactory pathways |
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Term
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Definition
stalk of the hypothalamus, connects to the pituitary gland. Main visceral control center of the body |
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Term
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Definition
Regulates blood pressure, rate, and force of heartbeat, digestive tract motility, rate and depth of breathing, and many other visceral activities Perception of pleasure fear, and rage Maintains normal body temperature Regulates feelings of hunger and satiety Regulates sleep and the sleep cycle |
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Term
Endocrine Functions of the Hypothalamus |
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Definition
Releasing hormones control secretion of hormones by the anterior pituitary. The supraoptic and paraventricular nuclei produce ADH and oxytocin |
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Term
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Definition
Most dorsal portion of the diencephalon, forms roof of the third ventricle |
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Term
Epithalamus - pineal gland |
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Definition
extends from the posterior border and secretes melatonin. |
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Term
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Definition
a hormone involved with sleep regulation, sleep-wake cycles, and mood |
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Term
Epithalamus - choroid plexus |
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Definition
a structure that secretes cerebral spinal fluid |
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Term
Brain Stem - three regions |
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Definition
Midbrain, pons, and medulla oblongata |
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Term
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Definition
automatic behaviors necessary for survival |
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Term
Brain stem - pathways and associations |
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Definition
Provides the pathway for tracts between higher and lower brain centers. Associated with 10 of the 12 pairs of cranial nerves |
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Term
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Definition
Located between the diencephalon and the pons |
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Term
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Definition
Cerebral peduncles and Cerebral aqueduct |
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Term
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Definition
two bulging structures that contain descending pyramidal motor tracts |
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Term
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Definition
Hollow tube that connects the third and fourth ventricles |
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Term
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Definition
Nuclei that control cranial nerves III (oculomtor) and IV (trochlear) |
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Term
Midbrain Nuclei - superior colliculi |
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Definition
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Term
Midbrain Nuclei - Inferior colliculi |
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Definition
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Term
Midbrain Nuclei - Substantia nigra |
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Definition
functionally linked to basal nuclei |
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Term
Midbrain Nuclei - Red nucleus |
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Definition
largest nucleus of the reticular formation; red nuclei are relay nuclei for some descending motor pathways |
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Term
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Definition
bulging brainstem regions between the midbrain and the medulla oblongata. Forms part of the anterior wall of the fourth ventricle |
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Term
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Definition
connect higher brain centers and the spinal cord. relay impulses between the motor cortex and the cerebellum |
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Term
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Definition
Origin of cranial nerves V (trigeminal), VI (abducens), and VII (facial) |
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Term
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Definition
Most inferior part of the brain stem Along with the pons, forms the ventral wall of the fourth ventricle. Contains a choroid plexus of the fourth ventricle |
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Term
Medulla Oblongata - Pyramids |
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Definition
two longitudinal ridges formed by corticospinal tracts |
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Term
Medulla Oblongata - decussation of the pyramids |
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Definition
crossover points of the corticospinal tracts |
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Term
Medulla Nuclei - Inferior olivary nuclei |
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Definition
gray matter that relays sensory information |
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Term
Medulla Nuclei - vestibular nuclear complex |
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Definition
synapses that mediate and maintain equilibrium |
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Term
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Definition
Cranial nerves X, XI, and XII are associated with the medulla Ascending sensory tract nuclei, including nucleus cuneatus and nucleus gracilis |
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Term
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Definition
Cardiovascular control center, respiratory centers, additional centers |
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Term
Medulla Nuclei - Cardiovascular Control Center |
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Definition
adjusts force and rate of heart contraction |
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Term
Medulla Nuclei - Respiratory centers |
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Definition
control rate and depth of breathing |
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Term
Medulla Nuclei - Additional Centers |
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Definition
regulate vomiting, hiccuping, swallowing, coughing, and sneezing |
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Term
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Definition
Located dorsal to the pons and medulla. Protrudes under the occipital lobes of the cerebrum. Makes up 11% of the brain mass. |
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Term
The Cerebellum - function |
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Definition
Provides precise timing and appropriate patterns of skeletal muscle contraction. Cerebellar activity occurs subconsciously |
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Term
Anatomy of the Cerebellum |
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Definition
Two bilateraly symmetrical hemispheres connected medially by the vermis |
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Term
Anatomy of the Cerebellum - Folia |
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Definition
transversely oriented gyri |
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Term
Anatomy of the Cerebellum - Hemisphere anatomy |
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Definition
Three lobes: Anterior, posterior, and flocculondular |
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Term
Anatomy of the Cerebellum - Neural Arrangement |
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Definition
gray matter cortex, internal white matter, scattered nuclei |
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Term
Anatomy of the Cerebellum - Arbor vitae |
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Definition
distinctive tree like pattern of the cerebellar white matter |
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Term
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Definition
Three paired fiber tracts that connect the cerebellum to the brain stem. All fibers in the cerebellum are ipsilateral. Superior, Middle, and Inferior peduncles. |
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Term
Cerebellar Penduncles - Superior Peduncles |
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Definition
Connect the cerebellum to the midbrain |
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Term
Cerebellar Penduncles - Middle peduncles |
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Definition
connect the pons to the cerebellum |
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Term
Cerebellar Penduncles - Inferior peduncles |
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Definition
connect the medulla to the cerebellum |
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Term
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Definition
Cerebellum receives impulses of the intent to initiate voluntary muscle contraction. Proprioceptors and visual signals "inform" the cerebellum of the body's condition. Cerebellar cortex calculates the best way to perform movement. A "blueprint" of coordinated movement is sent to the cerebral motor cortex |
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Term
Cerebellar Cognitive Function |
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Definition
Plays a role in language and problem solving. Recognizes and predicts sequences of events |
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Term
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Definition
Networks of neurons working together and spanning wide areas of the brain. |
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Term
Functional Brain system: Two systems |
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Definition
Limbic system and reticular formation |
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Term
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Definition
Structures located on the medial aspects of cerebral hemispheres and diencephalon. |
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Term
Limbic System - Structures |
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Definition
Rhiencephalon, amygdala, hypothalamus, and anterior nucleus of the thalamus |
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Term
Limbic System: Parts especially important to emotions |
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Definition
Amygdala, Cingulate gyrus. Put emotional responses to odors |
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Term
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Definition
deals with anger, danger, and fear responses |
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Term
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Definition
plays a role in expressing emotions via gestures, and resolves mental conflicts |
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Term
Limbic System: Emotion and Cognition |
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Definition
Interacts with the prefrontal lobes, therefore: one can act emotionally to conscious understandings, consciously aware of emotion in one's life |
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Term
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Definition
convert new information into long-term memories |
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Term
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Definition
Storage and retrieval of information |
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Term
Memory - THree principles |
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Definition
Storage, Processing, and Memory traces |
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Term
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Definition
occurs in stages and is continually changing |
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Term
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Definition
accomplished by the hippocampus and surrounding structures |
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Term
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Definition
chemical or structural changes that encode memory |
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Term
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Definition
Short-term and long-term. |
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Term
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Definition
Working memory A fleeting memory of events that continually happen. Lasts seconds to hours and is limited to 7 or 8 pieces of information |
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Term
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Definition
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Term
Factors that effect transfer of memory from STM to LTM include |
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Definition
Emotional State, Rehearsal, Association, Automatic Memory |
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Term
Transfer from STM to LTM - Emotional State |
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Definition
we learn best when we are alert, motivated, and aroused |
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Term
Transfer from STM to LTM - Rehearsal |
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Definition
repeating or rehearsing material enhances memory |
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Term
Transfer from STM to LTM - Association |
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Definition
associating new information with old memories in LTM enhances memory |
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Term
Transfer from STM to LTM - automatic memory |
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Definition
subconscious information stored in LTM |
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Term
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Definition
Fact memory and skill memory |
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Term
Fact (declarative) memory |
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Definition
Entails learning explicit information. Is related to our conscious thoughts and our language ability. Is stored with the context in which it was learned |
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Term
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Definition
Less conscious than fact memory and involves motor activity. Acquired through practice. Do not retain the context in which they were learned |
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Term
Structures involved in Fact memory |
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Definition
Hippocampus and the amygdala, both limb system structures Specific areas of the thalamus and hypothalamus of the diencephalon Ventromedial prefrontal cortex and the basal forebrain |
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Term
Structures Involved in Skill Memory |
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Definition
Corpus Striatum, Portion of the brain receiving the stimulus, promtor and motor cortex |
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Term
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Definition
mediates the automatic connections between a stimulus and a motor response |
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Term
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Definition
Neuronal RNA content is altered. Dendritic spines change shape. Extracellular proteins are deposited at synapses involved in LTM. Number and size of presynaptic terminals may increase. More neurotransmitter is release by presynaptic neurons. New hippocampal neurons appear |
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Term
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Definition
The brain is protected by bone, meninges, and csf. Harmful substances are shielded from the brain by the blood-brain barrier |
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Term
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Definition
Three connective tissue membranes lie external to the CNS - Duramater, arachnoid mater, and pia matter |
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Term
Functions of the meninges |
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Definition
Cover and protect the CNS. Protect blood vessels and enclose venous sinuses. Contains CSF. Form partitions within the skull |
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Term
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Definition
leathery, strong, menix composed of two fibrous connective tissue layers. Two layers separate in certain areas and form dural sinuses |
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Term
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Definition
extend inward and limit excessive movement of the brain. Falx cerebri, falx cerebelli, tentorium cerebelli |
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Term
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Definition
fold that dips into the longitudinal fissure |
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Term
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Definition
runs along the vermis of the cerebellum |
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Term
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Definition
horizontal dural fold extends into the transverse fissure |
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Term
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Definition
Middle menix, which forms a loose brain covering. Separated from the dura mater by the subdural space. Beneath the arachnoid is a wide subarachnoid space filled with CSM and large blood vessels. Arachnoid villi protrude superiorly and permit CSF to be absorbed into venous blood |
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Term
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Definition
Clusters of capillaries that form tissue fluid filters, which hang from the room of each ventricle. Have ion pumps that allows them to alter ion concentrations of the CSF. Helps cleanse CSF by removing waste |
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Term
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Definition
Protective mechanism that helps maintain a stable environment for the brain. Selective barrier that allows nutrients to pass freely. Is ineffective against substances that can diffuse through plasma membranes. Absent in some areas (vomiting center and the hyopthalamus) allowing these areas to monitor the chemical composition of the blood. Stress increases the ability of chemical to pass through the blood-brain barrier |
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Term
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Definition
CNS tissue is enclosed within the vertebral cloumn from the foramen magnum to L1. Provides two-way communication to and from the brain |
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Term
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Definition
Protected by bone, meninges, and CSF |
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Term
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Definition
space between the vertebrae and the dural sheath (dura mater) filled with fat and a network of veins |
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Term
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Definition
terminal portion of the spinal cord |
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Term
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Definition
fibrous extension of the pia mater; anchors the spinal cord to the coccyx |
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Term
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Definition
delicate shelves of pia mater; attach the spinal cord to the vertebrae |
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Term
Spinal Cord: number of nerves |
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Definition
31 pairs attach to the cord by paired roots |
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Term
Cervical and lumbar enlargements |
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Definition
sites where nerves serving the upper and lower limbs emerge |
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Term
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Definition
collection of nerve roots at the inferior end of the vertebral column |
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Term
Cross-Sectional anatomy of the spinal cord |
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Definition
Anterior median fissure, Posterior median sulcus |
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Term
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Definition
separates anterior funiculi |
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Term
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Definition
divids posterior funiculi |
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Term
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Definition
consists of soma, unmyelinated processes, and neuroglia |
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Term
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Definition
connects masses of gray matter; encloses central canal |
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Term
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Definition
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Term
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Definition
interneurons and somatic motor neurons |
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Term
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Definition
contain sympathetic nerve fibers |
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Term
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Definition
Dorsal half, ventral half, Dorsal and ventral roots |
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Term
Gray matter organization: dorsal half |
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Definition
sensory roots and ganglia |
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Term
Gray matter organization: ventral half |
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Definition
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Term
Gray matter organization: dorsal and ventral roots |
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Definition
fuse laterally to form spinal nerves |
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Term
Gray matter organization: four zones |
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Definition
Somatic sensory (SS) visceral sensory (VS), visceral motor (VM), somatic motor (SM) |
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Term
White matter in the Spinal Cord |
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Definition
Fibers run in three directions: ascending, descending, and transversely. Divided into three funiculi (columns) posterior, lateral, and anterior |
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Term
White matter in the spinal cord: funiculus |
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Definition
Each contains several fiber tracks. Fiber tract names reveal their origin and destination. Fiber tracts are composed of axons with similar function |
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Term
White Matter: Pathway Generalizations |
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Definition
Pathways decussate. Most consist of two or three neurons. Most exhibit somatotopy (precise spatial relationships). Pathways ares paired (one on each side of the spinal cord or brain) |
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Term
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Definition
The central processes of first-order neurons branch diffusely as they enter the spinal cord and medulla. Some branches take part in spinal cord reflexes. Others synapse with second-order neurons in the cord and medullary nuclei. Fibers from touch and pressure receptors form collateral synapses with interneurons in the dorsal horns |
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Term
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Definition
Nonspecific, Specific, Spinocerebellar |
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Term
Three Ascending Pathways: Nonspecific and specific ascending pathways |
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Definition
Send impulses to the sensory cortex. Responsible for discriminative touch and conscious proprioception |
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Term
Three Ascending Pathways: Spinocerebellar tracts |
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Definition
Send impulses to the cerebellum and do not contribute to sensory perception |
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Term
Nonspecific ascending pathway |
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Definition
Pain, temperature, and crude touch within the lateral spinothalamic tract |
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Term
Specific and Posterior Spinocerebellar Tracts |
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Definition
Specific ascending pathways within the fasciculus gracilis and fasciuculus cuneatus tracts, and their contiunation in the medial lemniscal tracts. The posterior spinocerebellar tract |
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Term
Descending (Motor) Pathways |
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Definition
Deliver efferent impulses from the brain to the spinal cord, and are divided into two groups. Motor pathways involve two neurons (upper and lower) |
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Term
Descending Motor Pathways: Two groups |
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Definition
Direct pathways: Equivalent to the pyramidal tracts Indirect pathways: Essentially all others |
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Term
The Direct (Pyramidal) System |
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Definition
Originate with the pyramidal neurons in the precentral gyri. Impulses are sent through the corticospinal tracts and synapse in the anterior horn. Stimulation of anterior horn neurons activates skeletal muscles. Corticobulbar tracts, innervate cranial nerve nuclei. Regulates fast and fine (skilled) movements |
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Term
Indirect (Extrapyramidal) System |
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Definition
Includes brain stem, motor nuclei, and all motor pathways not part of the pyramidal system. Includes the rubrospinal, vestibulospinal, recticulospinal, and tectospinal tracts |
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Term
Indirect (Extrapyramidal) System: Regulate |
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Definition
Axial muscles that maintain balance and psoture, Muscles controlling coarse movments of the proximal portions of limbs, head, neck and eye movement |
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Term
Extrapyramidal (Multineuronal) Pathways |
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Definition
Reticulospinal tracts, Rubrospinal tracts, Superior colliculi and tectospinal tracts |
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Term
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Definition
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Term
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Definition
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Term
Superior colliculi and tectospinal tracts |
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Definition
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