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Lab 8 & 9
CNS, PNS, Senses
88
Anatomy
Undergraduate 1
11/17/2014

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Term
Spinal Cord
Definition
Located in the vertebral foramen
It begins at the foramen msgnum and ends at the conus medullaris in the lumbar region.
It conducts sensory impulses to the brain and motor impulses from the brain to the body
Term
cerebrum
Definition
Composed of the frontal, parietal, occipital, and temporal lobes (Largest part of brain)
Term
Frontal lobes
Definition
Has motor functions, but also deal with aggression, mood, foresight, motivation, and social judgements.
Term
Parietal lobes
Definition
Function in integration of sensory information with the exceptions of vision, hearing, and smell
Term
Occipital lobe
Definition
Functions to receive and interpret visual signals
Term
Temporal lobe
Definition
Functions in memory, vision, learning, hearing, and emotional behavior
Term
Gyri
Definition
These are THICK FOLDS in the surface of the cerebrum
Term
Gyri
Definition
These are THICK FOLDS in the surface of the cerebrum
Term
Sulci
Definition
These are SHALLOW GROOVES in the surface of the cerebrum
Term
Longitudinal fissure
Definition
This fissure is a deep groove separating the cerebrum into right and left halves
Term
Cerebral Hemisphere
Definition
the longitudinal fissure divides the cerebrum into the right and left cerebral hemispheres
Term
cerebellum
Definition
Is involved in the regulation of the posture and balance, fine motor control of skeletal muscles, and repetitive movements
Term
Pituitary gland
Definition
An endocrine gland directly attached to the hypothalamus. It is divided into anterior and posterior portions.
Anterior: produces hormones which regulate other endocrine glands, and directly affect target cells.
Posterior: functions to store and release hormones produced by the hypothalamus
Term
Thalamus
Definition
This structure functions to integrate all sensory information (w/ the exception of smell) from the body, and channels it into proper processing regions in the cerebrum
Term
Hypothalamus
Definition
The structure that is the major integration system between various organ systems and the nervous system. It coordinates activities of both the nervous and endocrine systems, and between voluntary and autonomic activities. It is attached directly to the pituitary gland
Term
Mammillary body
Definition
A structure that processes olfactory information and contains centers for reflex movements involved in eating, such as chewing, licking, and swallowing
Term
Pineal body
Definition
The region that regulates day/night cycle. Secretes the hormone melatonin, which effects sleepiness
Term
Corpus callosum
Definition
The part of the brain that contains the nerve tracts and physically joins the two hemispheres
Term
Midbrain
Definition
A region that is also called the "mesencephalon" The oculomotor, trochlear, and trigeminal cranial nerves originate in this area
Term
Pons
Definition
It works w/ the medulla to control respiration and helps regulate sleep. It is the origin for the trigeminal, abducens, facial, and vestibulocochlear cranial nerves
Term
Medulla oblongata
Definition
It contains nerve centers for the regulation of heart rate, blood vessel diameter, respiration, swallowing, vomiting, coughing, sneezing, and hiccoughing
Term
Optic Chiasma
Definition
a structure that is located on the bottom-center of the brain where the two optic nerves cross
Term
Olfactory bulbs
Definition
They function in the sense of smell
Term
White matter of the spinal cord
Definition
Surrounds gray matter. Composed of both myelinated and unmyelinated axons.
(Three parts)
1. Anterior
2. lateral
3. posterior columns
Term
Gray matter of the spinal cord
Definition
Shaped like a butterfly. It is composed of neuron cell bodies, neuroglia cells, dendrites, and unmyelinated axons (three regions)
1.anterior
2. lateral
3.posterior horns
The central canal is the center of the gray matter
Term
Dorsal root of the spinal nerve
Definition
These structures contain the axons of the autonomic sensory neurons
Term
Dorsal root ganglion
Definition
This area contains the cell bodies of somatic and autonomic sensory neurons (thick bulb)
Term
Ventral root
Definition
This structure contains the cell bodies of the somatic motor neurons that innervate the skeletal muscles
Term
Spinal nerve
Definition
These are the nerve tracts that connect the spinal cord with various regions of the body (dorsal and ventral merge)
Term
Central Canal
Definition
Through the middle of the gray matter
Term
Olfactory nerve (I)
Definition
A sensory nerve functioning in the sense of smell
Term
Optic nerve (II)
Definition
A sensory nerve involved in vision
Term
Oculomotor (III)
Definition
A sensory function is to provide on the information on the position of the eye. Motor functions include eye and eye lid movement, controlling pupil diameter, and focusing
Term
Trochlear nerve (IV)
Definition
sensory function is to provide information on the position of the eye. Motor functions are lateral and inferior movement of the eye
Term
Trigeminal nerve (V)
Definition
Sensory function is to transport information from various touch receptors on the face. Motor function is cheweing
Term
Abducens nerve (VI)
Definition
Sensory function is to provide information on the position of the eye. Motor function is the lateral movement of the eye
Term
Facial nerve (VII)
Definition
Sensory functions are receptions of taste stimuli from the anterior two-thirds of the tongue and the position of the face and scalp muscles. Motor functions include controlling facial expressions and secretions from the salivary glands
Term
Vestibulocochlear (VII)
Definition
Sensory nerve in functioning in hearing and equilibrium. Motor functions include a response by the head and neck changes in eqilibrium
Term
Glossopharyngeal nerve (IX)
Definition
Sensory functions are taste and touch by the tongue, the gag reflex, regulation of blood pressure, and respiration. Motor functions include control of pharyngeal muscles in swallowing, speech, salivation, and the gag reflex
Term
Vagus (X)
Definition
Sensory functions involve sensations from the respitory tract, pharyngeal region, external ear canal, and of hunger and fullness. Motor functions include controlling swallowing, coughing, speech, and smooth muscles of the respitory and digestive systems
Term
Accessory nerve (XI)
Definition
Sensory function is to provide information on the position of the muscles of the head, neck, and shoulders. Motor functions include controlling those muscles and voluntary swallowing
Term
Hypoglossal nerve (XII)
Definition
Sensory function is to provid information on the tongue movement. Motor function is to control muscles involved in food manipulation, swallowing and speech
Term
Free nerve endings
Definition
Location:
They are widespread,superficial, and found in hairy and hairless skin

Functions:
light touch, temperature,and pain
Term
Hair follicle receptors
Definition
Location:
A dendrite wrapped around a hair follicle

Funtion:
light touch when the hair is displaces
Term
Meissner's corpuscles
Definition
Location:
Found in the dermal papillae

Fucntion:
light touch and low-frequency vibration
Term
Merkel's nerve complex
Definition
Location:
Found in the stratum basale of hairy and hairless skin

Function:
pressure touch
Term
Lamellated or Pacinian corpuscles
Definition
Location:
In the dermis, joint capsules, some viscera, genitals, and breasts

Functions
High frequency vibration, pressure, stretch, and tickling
Term
Ruffini's cylinders
Definition
Location:
in the dermis and joint capsules

Functions:
pressure touch
Term
Supporting cells
Definition
form the capsule surrounding the taste receptor cells. These cells support and protect the receptor cells
Term
Taste receptor cells
Definition
These are approx. 50 receptor cells in este bud. A receptor cell has a microvilli, called "taste hair", protruding through a pore on the apical surface of the taste bud. these hairs are the receptor surface for the taste stimuli
Term
Basal cells
Definition
These are found peripherally on the base of a taste bud. they develop into supporting cells and then into receptor cells which live about 10 days
Term
filiform papillae
Definition
These are small, spike-lke, projections found all over the tongue. They are the most abundant papillae, but lack taste buds. They roughen the tongue and aid in food manipulation
Term
Foliate papillae
Definition
These papillae form parallel bands on the sides of the posterior two-thirds of the tongue. They have few taste buds
Term
Fungiform papillae
Definition
These papillae, as the name implies, are mushroomed-shaped projections found allover the tongue, although they tend to be concentrated on the tip and sides. each papillae has about 5 taste buds
Term
Vallate papillae
Definition
These are large circular papillae with a depression in the middle. there are about 12 of them arranged in a V-shaped row on the back of the tongue. They contain from 100-300 taste buds
Term
Olfactory epithelium
Definition
Comprises the two olfactory organs in the nasal cavity
Term
Lamina propria
Definition
the connective tissue beneath the olfactory epithelium
Term
Olfactory receptor cells
Definition
Bipolaar neurons found in the olfactory epithelium. The dendrite is enlarged into a bulb-shaped "olfactory vesicle" on the surface of the olfactory epithelium. The olfactory vesicle has cilia called "olfactory hairs" which project into mucus on the surface of the epithelium. Odors cause depolarization on these hairs.
Term
Basal Cells
Definition
These cells replace lost or damaged olfactory receptor cells are the base of the olfactory epithelium (they are a notable exception to the rule of thumb that neurons do not replicate)
Term
Bowman's glands
Definition
These are mucus glands found in the laminia propria that moisten olfactory epithelium and dissolve odor molecules
Term
Auricle or pinna
Definition
Functions to collect sound waves and direct them into the external auditory canal
Term
External auditory canal
Definition
The passageway that directs sound waves from the auricle to the tympanic membrane
Term
Tympanic membrane
Definition
It separates the outer and middle ears. Vibrates when struck b y sound waves and mechanically transfers the sound to the middle ear
Term
ceremonious glands
Definition
These glands secrete cerumen (earwax) into the external auditory canal. Helps prevent foreign substances from reaching the delicate tympanic membrane
Term
Malleus
Definition
Articulates with the incus and transmits vibrations from the tympanic membrane to the incus
Term
Incus
Definition
Articulates with the malleus and stapes and transmits vibrations from the malleus to the stapes
Term
Stapes
Definition
Articulates with the incus and the oval window and transmits vibrations from the incus to the oval window
Term
Oval window
Definition
An opening bwtween the middle ear and inner ear. The stapes attaches to the membrane over the oval window, and transfers the vibrations to the fluid in the inner ear.
Term
ROund window
Definition
An opening directly below the oval window. Covered by a secondary tympanic membrane. Bulges out into the middle ear to dissipate the pressure waves within the cochlea, after they have been detected by the inner ear
Term
Eustachian tube
Definition
A tube connecting the middle ear and the nasopharynx. it equalizes the air pressure in the middle ear with that atmospheric pressure, enabling the tympanic membrane to vibrate freely
Term
Stapedius
Definition
A small skeletal muscle which protects the oval window by dampening the vibration of the stapes in response to loud noises
Term
Tensor tympani
Definition
A small skeletal muscle which limits movement of ossicles and increases tension of the tympanic membrane to prevent damage in response to loud, prolonged noises
Term
Bony labyrinth
Definition
A series of interconnected passageways in the temporal lobe
Term
Membranous labyrinth
Definition
A series of inter connected fluid filled tubes found within the bony labyrinth
Term
Cochlea
Definition
A part of the bony labyrinth resembling a snail shell it contains the cochlear duct
Term
Cochlear duct
Definition
A part of the membranous labyrinth found within the cochlea. it contains hearing receptors
Term
Vestibule
Definition
A part of the bony labyrinth containing saccule and utricle
Term
Saccule and Utricle
Definition
A pair of membranous sacs found within the vestibule that contain the receptor cells for gravity and linear acceleration
Term
Semicircular canals
Definition
A part of he bony labyrinth containing semicircular ducts
Term
Semicircular ducts
Definition
A series of three fluid filled ducts found within the semicircular canals. The receptors in the ducts provide information on the position of the head and the body in space, acceleration, and deceleration
Term
Eyebrows
Definition
Partially shade eyes and protect them from sweat
Term
Eyelids
Definition
moisten eye and sweep foreign substances from the eyes surface
Term
Eyelashes
Definition
Prevent foreign substances from entering the eye
Term
Lacrimal apparatus
Definition
Composed of the lacrimal gland and lacrimal ducts. Secretions or tears from the gland moisten the eye and washes away foreign substances
Term
Conjunctiva
Definition
Helps keep the cornea moist and clean
Term
Oblique eye muscles
Definition
Superior oblique: rotates the eye downward and medially
Inferior oblique: Rotates the eye upward and medially
Term
Rectus eye muscles
Definition
1.Superior
2.Inferior
3.Medial
4.Lateral rectus muscles
Term
Aqueous and vitreous humours
Definition
These are jelly-like fluids that fill the interior of the eye
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