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Brain
parts of the brain
26
Anatomy
Undergraduate 3
10/28/2006

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Term
gyrus
Definition
singular elevated ridge on cerebral cortex
Term
sulcus
Definition
groove on cerebral cortex
Term
Choroid plexus
Definition
dark gap beside pineal gland and below corpus callosum
Term
Pituitary gland
Definition
below hypothalamus
Term
Infundibulum
Definition
connects hypothalamus to pituitary gland, ventral (in front of) to the hypothalamus
Term
Mammillary Body
Definition
caudal end of hypothalamus; oval area posterior to the optic chiasma; olfactory relay station
Term
Third Ventricle
Definition
longitudinal slit that's immediately below the choroid process
Term
Intermediate Mass
Definition
thalamus midline commissure connected right and left thalamus halves
Term
Optic Chiasma
Definition
Anterior to Hypothalamus; where optic nerves decussate;
Term
Optic Tract
Definition
leads from the optic chiasma and terminates in the lateral geniculate body
Term
Lateral geniculate body
Definition
functions in initial processing of visual information; lateral to the colliculi
Term
Medial geniculate body
Definition
Auditory reflex center
Term
Mesencephalon
Definition
region known as the midbrain
Term
Tectum
Definition
roof of midbrain comprised of the corpora quadrigemina
Term
Corpora quadrigemina
Definition
Four prominent round swellings in midbrain
Term
Superior Colliculi
Definition
Large, anterior swellings on midbrain; coordinate head & eye movements when visually tracking an object
Term
Inferior Colliculi
Definition
smaller, posterior swellings on midbrain; audiotry relay stations and integrating auditory reflex center
Term
Trochlear Nerves
Definition
arise slightly posterior to the inferior colliculi; carries motor fibers to & proprioceptor fibers from one of the extrinsic eye muscles
Term
Cerebral peduncle
Definition
anterior to the pons, posterior to the mammillary body of hypothalamus; bulging pair on ventrolateral surface of midbrain
Term
Pons
Definition
ventral portion of brainstem; bulges out posterior to the cerebral peduncles
Term
Trigeminal Nerve
Definition
large nerve that extends across the base of the middle cerebellar peduncle; control the chewing muscles and carry afferent info to the head and face
Term
Abducens Nerve
Definition
arises from the trapezoid body; supplies motor fibers to one extrinsic eye muscle & conveys proprioceptive info from that muscle
Term
Fourth Venricle
Definition
between cerebellum & medulla oblongata; in central canal
Term
Ventral Median Fissure
Definition
midventral groove of medulla
Term
Pyramids
Definition
longitudinal bands on tissue beside ventral median fissure; comprised of corticospinal tracts (phyramidal system)
Term
Olives
Definition
oval swellings lateral to the pyramids and posterior to the trapezoid body
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