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Parts of the Brain / Neural & Hormonal Systems
Vocabulary covering important parts of the brain and their respective functions
55
Psychology
12th Grade
10/02/2012

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Term
Amygdala
Definition
Adds emotion to memory and stimulates aggression and fear
Term
Hypothalamus
Definition
Controls basic activities such as hunger, thirst, and temperature; governs endocrine system via pituitary gland
Term
Hippocampus
Definition
Central part of limbic system; linked to memory formation
Term
Thalamus
Definition
Central "headquarters" of the brain; receives sensory information (except smell) and sends it to higher brain regions
Term
Corpus Callosum
Definition
Neural fibers that connect the hemispheres
Term
Cerebellum
Definition
Coordinates voluntary movement and balance; enables nonverbal learning, modulates emotions, distinguishes between textures/sounds
Term
Reticular Formation
Definition
Controls arousal and consciousness
Term
Cerebral Cortex
Definition
Outer covering of the brain; consists of four lobes (frontal, parietal, occipital, temporal); associated with higher thinking functions
Term
Medulla
Definition
Controls involuntary behavior such as breathing and heartbeat
Term
Frontal Lobe
Definition
Located behind forehead; makes judgements and future plans; involved with speech
Term
Parietal Lobe
Definition
Located at top of head; receives sensory input for touch and body positioning
Term
Occiptal Lobe
Definition
Located at back of head; receives visual information
Term
Temporal Lobe
Definition
Located at side of head; receives auditory information
Term
Association Areas
Definition
Extra cranial tissue that integrates sensory information with memory and thinking (considered higher brain regions)
Term
Broca's Area
Definition
Located in frontal lobe; involved with speaking
Term
Wernick's Area
Definition
Located in temporal lobe; understands language
Term
Brainstem
Definition
Oldest part of brain that is responsible for automatic survival functions; includes medulla and reticular formation
Term
Limbic System
Definition
Located at border of cerebrum and brainstem; consists of amygdala, hippocamus, hypothalamus; maintains self-preservation
Term
Motor Cortex
Definition
Located behind frontal lobe; controls voluntary muscle movements of opposite sides of the body
Term
Sensory Cortex
Definition
Located in front of parietal lobe; registers body sensations
Term
Neurons
Definition
Nerve cells
Term
Sensory Neurons
Definition
Carry messages from the body's tissues and sensory organs inward toward the spinal cord and brain
Term
Motor Neurons
Definition
Carry messages from the brain and spinal cord outward toward the body's tissues
Term
Interneurons
Definition
Processes information between sensory and motor neurons
Term
Dendrite
Definition
Fibers on a neuron that receive incoming information and conduct it toward the cell body
Term
Axon
Definition
Extension that passes messages away from the neuron cell body toward other neurons, muscles, or glands
Term
Myelin Sheath
Definition
Layer of fatty tissue that insulates the axon and helps speed up impulses
Term
Action Potential
Definition
Brief electrical charge that travels down the axon (neural impulse)
Term
Resting Potential
Definition
Electrical state of a neuron at rest, when the inside of the axon is negatively charged and the exterior is negatively charged
Term
Synapse
Definition
Junction between axon of a sending neuron and dendrite of a receiving neuron
Term
Neurotransmitters
Definition
Chemical messengers that cross the synaptic gaps and bind to receptor sites on the receiving neuron, influencing whether that neuron will generate an impulse or not
Term
Reputake
Definition
Process whereby neurotransmitters are reabsorbed by the sending neuron
Term
Endorphins
Definition
Body's naturally occurring morphine neurotransmitters
Term
Agonist
Definition
Molecules that mimic neurotransmitters and their effects
Term
Antagonists
Definition
Molecules that inhibit neurotransmitters by blocking their active sites
Term
Acetylcholine (ACh)
Definition
Neurotransmitter that enables muscle action, learning, memory; with Alzheimer's these neurons deteriorate
Term
Dopamine
Definition
Neurotransmitter that influences movement, learning, attention, emotion; excess causes schizophrenia, undersupply leads to Parkinson's disease
Term
Serotonin
Definition
Neurotransmitter that affects mood, hunger, sleep, arousal; undersupply causes depression
Term
Norepinephrine
Definition
Neurotransmitter that controls alertness/arousal; undersupply depresses mood
Term
GABA (gamma-aminobutyric acid)
Definition
Major inhibitory neurotransmitter; undersupply causes seizures, tremors, insomnia
Term
Glutamate
Definition
Major excitatory neurotransmitter involved in memory; excess causes migraines and seizures
Term
Nervous System
Definition
Body's electrochemical communications network; made up of peripheral and central nervous systems
Term
Central Nervous System (CNS)
Definition
Formed by brain and spinal cord
Term
Peripheral Nervous System (PNS)
Definition
Sensory and motor neurons that connect to the CNS and the rest of the body; made up of somatic and autonomic nervous systems
Term
Nerves
Definition
Bundled axons that connect CNS with muscles, glands, sense organs
Term
Somatic Nervous System
Definition
Enables voluntary control of muscles (part of PNS)
Term
Autonomic Nervous System
Definition
Controls glands and muscles of internal organs (part of PNS); made up of sympathetic and parasympathetic nervous systems
Term
Sympathetic Nervous System
Definition
Arouses the body and mobilizes energy (part of autonomic nervous system)
Term
Parasympathetic Nervous System
Definition
Calms the body and conserves energy (part of autonomic nervous system)
Term
Neural Networks
Definition
Brain clusters of neurons involved in learning
Term
Spinal Cord
Definition
Connects PNS to brain; involved in reflexes
Term
Endocrine System
Definition
Body's slow chemical communication system; set of glands that secrete hormones into bloodstream
Term
Hormones
Definition
Chemical messengers that affect tissues; sometimes outlast effects of neural messages
Term
Adrenal Glands
Definition
Endocrine glands above the kidneys that secrete adrenaline (epinephrine and norepinephrine)
Term
Pituitary Gland
Definition
Endocrine system's most influential gland; under direction of hypothalamus, it simulates growth and controls all hormones
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