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Internal Morphology of the Brainstem
& Vestibular SYstem, & Cerebellum
93
Anatomy
Graduate
03/01/2015

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Term
what forms the pyramids?
Definition
corticospinal tracts
Term
where are the pyramids located
Definition
ventral surface of the medulla
Term
represents the crossover point of corticospinal fibers
Definition
pyramidal decussation
Term
cuneate structures from internal to external (3)
Definition
nucleus, fasciculus, tubercle
Term
gracile structures from internal to external
Definition
nucleus, fasciculus, tubercle
Term
trigeminal eminence is formed by what
Definition
spinal nucleus of V
Term
think dark area just lateral to the lightly staining spinal nucleus of V
Definition
descending tract of V
Term
3 dorsal sulci (above T6)
Definition
dorsal median, dorsal intermediate, dorsolateral
Term
separates fasciculi cuneate and gracile in the SC and medulla
Definition
dorsal intermediate sulcus
Term
at the level of the sensory decussation, what has not crossed yet?
Definition
descending motor fibers, externally they form the pyramids
Term
internal arcuate fibers are contained where
Definition
reticular formation
Term
what forms the sensory decussation?
Definition
where internal arcuate fibers cross and become the medial lemniscus
Term
internal arcuate fibers become the medial lemniscus how?
Definition
cross onto the contralateral side
Term
difference between closed and open medulla
Definition
presence of the 4th ventricle
Term
what forms the olive
Definition
inferior olivary nucleus
Term
where do climbing fibers enter
Definition
cerebellum
Term
inferior olivary nucleus contains cells of origin of axons known as...
Definition
climbing fibers
Term
inferior cerebellar peduncles carry fibers to the cerebellum from where
Definition
medulla
Term
Median and Inferior vestibular nuclei have a salt and pepper appearance due to what
Definition
combo of cell bodies and myelinated descending motor fibers from lateral vestibular nucleus
Term
nucleus which resembles inferior olivary nucleus and is one of the deep cerebellar nuclei
Definition
dentate nucleus
Term
4 deep cerebellar nuclei
Definition
dentate, emboliform, globose, fastigal
Term
what forms the facial colliculi
Definition
fibers of the facial nerve travelling over the abducens nuclei
Term
structure medial to the lateral lemnsicus and continuous with it
Definition
medial lemniscus
Term
fibers of what structure enter the inferior colliculus
Definition
lateral lemniscus
Term
medial geniculate body is part of what?
Definition
thalamus
Term
Vestibular System projects to where (5)
Definition
cortex, thalamus, cerebellum, brainstem, spinal cord
Term
primary vestibular fibers enter the brainstem where
Definition
cerebellopontine angle
Term
fibers which enter the cerebellopontine angle constitute what?
Definition
vestibular nerve
Term
vestibular nerve is which part of CN VIII
Definition
medial
Term
after entering the brainstem, some primary vestibular fibers of CN VIII enter the cerebellum directly via what
Definition
juxtarestiform body
Term
most medial inferior portion of the inferior cerebellar peduncle
Definition
juxtarestiform body
Term
majority of primary vestibular fibers bypass the cerebellum and synapse directly on what
Definition
vestibular nuclei
Term
what are the 4 major vestibular nuclei
Definition
superior, inferior, medial, lateral
Term
vestibular nuclei extend from where
Definition
medulla
Term
vestibular nuclei extend through where
Definition
lower pons
Term
vestibular nuclei occupy position where
Definition
floor and lateral wall of the 4th ventricle
Term
fibers projecting rostrally from teh superior and medial vestibular nuclei, and fibers projecting caudally from the medial and lateral vestibular nuclei
Definition
medial longitudinal fasciculus
Term
inferior vestibular nucleus contains fibers of what tract
Definition
fibers of the lateral vestibulospinal tract
Term
which vestibular nucleus receives the greatest number of primary vestibular fibers
Definition
inferior vestibular nucleus
Term
cell bodies from the medial vestibular nucleus have axons that ascend and descend what
Definition
medial longitudinal fasiculus
Term
descending axons from the medial vestibular nucleus comprise what tract
Definition
medial vestibulospinal tract
Term
ascending axons from the medial vestibular nucleus project where?
Definition
CN III, IV, VI
Term
ascending axons from the medial vestibular nucelus control what functions?
Definition
control of extraocular eye muscles
Term
which vestibular nucleus is the only one to recieve descend afferents from more rostral areas of the brainstem
Definition
medial vestibular nucleus
Term
axons from which nucleus synapse on lateral rectus muscles?
Definition
abducens nucleus
Term
axons from the abducens nucleus synapse on what?
Definition
lateral rectus muscles
Term
the abducens nucleus receives vestibular projections via what
Definition
medial longitudinal fasiculus
Term
vestibular nuclei are no longed present at what rostral level?
Definition
upper pons
Term
ascending vestibular fibers from the vestibular nuclei continue in what in the Upper Pons?
Definition
medial longitudinal fasiculus
Term
the trochlear nerve innervates what eye muscle
Definition
superior oblique mm
Term
the trochlear nucleus receives ascending vestibular fibers from what structure at the level of the inferior colliculi
Definition
medial longitudinal fasciculus
Term
cranial nerve nucleus at the level of the superior colliculus
Definition
oculomotor nucleus
Term
the fibers of teh oculomotor nucleus travel through and around what to form CN III
Definition
red nucleus
Term
structure thought to send descending bilateral projections in the medial longitudinal fasiculus to nuclei of CN II< IV and medial vestibular nuclei
Definition
interstitial nucleus of cajal
Term
Ventral Posterior Inferior nucleus of the thalamus recieves what input?
Definition
vestibular
Term
VPI relays information to the postcentral gyrus in the parietal lobe near where?
Definition
junction of Brodmann's areas 2&5
Term
area considered the primary vestibular area of teh cortex for conscious perception of movements of the head in space
Definition
Brodmann's area 2&5
Term
cerebellum lies under what dura mater
Definition
tentorium cerebelli
Term
cerebellum likes posterior to what 2 structures
Definition
pons and medulla
Term
what forms the roof of the 4th ventricle
Definition
cerebellum
Term
the cerebellum is divided into what?
Definition
lateral hemispheres
Term
each lateral hemisphere contains these structures on teh superior surface (4)
Definition
anterior lobe, posterior lobe, primary fissure, vermis
Term
the inferior view of the cerebellum contains these 3 structures
Definition
vermis, tonsil, horizontal fissure
Term
what is the inferior most part of the vermis
Definition
nodulus
Term
5 structures of the ventral view of the cerebellum
Definition
SCP, MCP, ICP, flocculus, nodulus
Term
SCP mainly carries information from where
Definition
the cerebellum
Term
SCP mainly carries information to where
Definition
midbrain and thalamic structures
Term
MCP carries what type of information
Definition
descending
Term
MCP carries descending information from where
Definition
the cortex
Term
MCP carries descending information to where
Definition
cerebellum
Term
MCP carries descending information from the cortex via what?
Definition
pons
Term
ICP carries information from where
Definition
ascending tracts and nuclei in the medulla
Term
ICP carries information to where
Definition
cerebellum
Term
ventral spinocerebellar tract conveys information primarily from where
Definition
lower limb
Term
spinocerebellar tract that is a double crossed tract
Definition
ventral spinocerebellar tract
Term
ventral spinocerebellar tracts cell bodies of origin are located where
Definition
intermediate zone of spinal gray matter
Term
ventral spinocerebellar tract ascends how
Definition
contralaterally
Term
ventral spinocerebellar tract crosses back to the ipsilateral side where
Definition
decussation of the SCP
Term
dorsalspinocerebellar tract can begun to be seen at which level?
Definition
lumbar level
Term
what are the cells of origin for the dorsal spinocerebellar tract
Definition
nucleus dorsalis/clark's column
Term
fibres that will synapse in the accessory (lateral) cuneate nucleus are located where
Definition
cuneate fasciculus
Term
at the sensory decussation, the Dorsal Spinocerebellar tract has moved dorsally just lateral to what tract?
Definition
spinal tract of V
Term
Dorsal spinocerebellar tract enters the cerebellum via what
Definition
ICP
Term
the ventral spinocerebellar tract enters the cerebllum via what?
Definition
superior cerebellar peducnle
Term
where does the cuneocerebellar tract originate
Definition
accessory cuneate nucleus
Term
climbing fibers originate from the inferior olivary nucleus and cross to the contralateral side through what
Definition
medial lemniscus
Term
climbing fibers cross from the inferior olivary nucleus, through the medial lemniscus to where
Definition
inferior cerebellar peduncle
Term
pontocerebellar fibers cross and enter the cerebllum through what
Definition
middle cerebellar peduncle
Term
fibers of the pontocerebellar group can be distinguished from fibers in the medial leminiscus or corticospinal tracts how?
Definition
pontocerebellar fibers travel horizontally
Term
superior medullary vellum contains what fibers
Definition
decussating fibers of the trochlear nerve
Term
decussation of the SCP is at what level
Definition
inferior colliculus
Term
why are the fibers of the ventral spinocerebellar tract not visible at the level of the inferior colliculi?
Definition
the fibers of teh VSCT decussate back to their side of origin
Term
tract just medial to fibers of the medial lemniscus and trigeminothalamic tract at the level of the superior colliculus
Definition
dentatorubrothalamic tract
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