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neuro 2nd shift > cerebellum > Flashcards

cerebellum Flashcards

1
Q

function of cerebellum in general

A

integrates sensory/other inputs from the brain and SC

coordinates ongoing movements and functions in motor planning

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2
Q

does the cerebellum have direct connections to the LMN

A

no

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3
Q

what divides the 2 cerebellar hemispheres

A

vermis

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4
Q

what divides the anterior and middle/posterior lobe of the cerebellum

A

primary fissure

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5
Q

this herniate through the foramen magnum if intracranial psi in inc

A

cerebellar tonsil

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6
Q

3 main lobes of the cerebellum

A

anterior, middle and flocculonodular

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7
Q

this is situated betw primary and uvulonodular fissures

A

middle lobe

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8
Q

this is situated posterior to uvulonodular fissure

A

flocculonodular lobe

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8
Q

it separates the cerebellum into superior and inferior surfaces

A

horizontal fissure - along the margin

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9
Q

what are the 3 functional subdivisions of the cerebellum

A

vermis
flocculonodular lobe
cerebellar hemis - intermediate and lateral zone

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10
Q

function of vermis

A

influences movement or coordination of neck, shoulder, thorax, abdomen and hips

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11
Q

function of flocculonodular lobe

A

balance and vestibulo-ocular reflex

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12
Q

function of intermediate zone

A

controls coordination or muscles of distal part of limbs

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13
Q

function of lateral zone

A

planning of sequential movements of entire body; conscious assessment of movement errors

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14
Q

area immediately lateral to the vermis

A

intermediate zone

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15
Q

motor pathway influenced by lat hemisphere

A

lateral corticospinal

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16
Q

motor pathway influenced by intermediate hemisphere

A

lateral corticospinal and rubrospinal

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17
Q

motor pathway influenced by vermis

A

anterior corticospinal
reticulospinal
vestibulospinal
tectospinal

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18
Q

motor pathway influenced by flocculonodular lobe

A

medial longitudinal fasciculus

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19
Q

separates middle lobe from flocculonodular lobe

A

uvolunodular fissure - ventroinferior surface

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20
Q

white and gray matter distrib of cerebellum

A

outer gray (cortex) tas inner white c intracerebellar nuclei

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21
Q

what does each folium or fold contain

A

core of white matter covered in gray matter

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22
Q

small ridges that run from medial to alt surface of cerebellum

A

folia

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23
Q

layers of cerebellar cortex from outer to inner

A

molecular
purkinje
granular

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24
2 types of neurons found in the molecular layer
outer - stellate inner - basket
25
these cells are scattered among dendritic arborizations and numerous thin axons that run parallel to long axis of folia
stellate and basket unmyelinated granule axons and purkinje dendrites
26
what is found in the purkinje layer
purkinje cells - golgi type 1
27
exp the path of purkinje dendrites
dendrites pass into molecular layer tas dun sila mag branch out then spines from synapses c parallels granule cell axons
28
describe structure of purkinje dendrites
primary and second branches are smooth tas yung sunod mga dendritic spines na
29
exp the path of purkinje axons
axons pass through granular layer tas enter white matter tas mag terminate by synapsing intrecerebellar nuclei collateral branches synapses c dendrites of basket and stellate few axons ends in vestibular nuclei
30
what cells are present on the granular layer
granular cells and parallel fibers golgi cells
31
exp dendrites of granular cells
each cells gives rise to 4-5 dendrites na claw like and synapse c mossy fiber input
32
exp axons of granular cells
each axon pass through molecular later and bifurcates at T-junction = parallel fibers
33
exp parallel fibers of granular cells
run parallel to long axis of folium run at right angles to dendrites of purkinje and synapse c them
34
exp golgi cells in granular layer
dendrites nila will ramify in molecular layer axons terminate c dendrites of granular cells
35
what are the intracerebellar from lateral to medial
dentate emboliform globose fastigial
36
what are intracerebellar nuclei
mga gray matter embedded in white matter on each side of midline
37
exp axons of intracerebellar nuclei
axons form cerebellar outflow in the sup and inf cerebellar peduncles hence all outputs from cerebellum are relayed by cerebellar nuclei
38
what do intracerebellar nuclei recieves
recieve collateral fibers of cerebellar inputs papunta sa cerebellar cortex
39
largest cerebellar nuclei
dentate nucleus
40
shape of dentate nucleus
crumpled bag c opening facing medially
41
discuss interior of dentate nuc
filled c white matter tas may efferents that leaves to form superior cerebellar peduncle
42
what does dentate nuc recieve
projections from lateral cerebellar hemisphere
43
when is the dentate nuc active
just before voluntary movement
44
ovoid and medial to the dentate
emboliform nucleus
45
consists of one or more rounded cells groups medial to emboliform
globose nucleus
46
what is the interposed nuc
emboliform + globose
47
what does the interposed nuc recieve
inputs from intermediate part of cerebellar hemisphere
48
when is interposed nuc active
during and in relation to movement
49
found near midlines in vermis and close to roof of 4th vent
fastigial nucleus
50
what does the fastigial nucleus recieve
input from vermis and flocculonodular lobe
51
what fibers project to vestibular nuclei
most of fibers leaving inferior vermis and floccule
52
what is arbor vitae
small amount of white matter in vermis - like branches of tree
53
what are the 3 groups of white matter in cerebellar hemisphere
intrinsic afferent efferent
54
discuss intrinsic white matter
does not leave cerebellum connects diff regions ng vermis or cortex or the hemispheres
55
discuss afferent white matter
from greater part of WM then proceed to cerebellar cortex enter through inferior and middle cerebellar peduncles
56
discuss efferent white matter
output start as axons of purkinje then synapse with the cerebellar nuclei tas mag leave ng cerebellum few axons of purkinje na galing flocollunodular lobe and verrmis pass cerebellar nuc and leave w/o synapsing
57
axons that leave via SCP
axons from dentate, emboliform and globose
58
fibers that leave via ICP
fastigial nuc
59
fibers that leave juxtarestiform body
vestibular nuc
60
brachium conjunctivum
SCP
61
brachium pontis
MCP
62
restiform body
ICP
63
forms the wall of 4th ventricle
cerebellar peduncles
64
carries mainly output from cerebellum
SCP
65
where does SCP decuss
level of inferior coll
66
carries mainly input from cerebellum
MCP and ICP
67
blood supp of lateral medulla, inferior half of cerebellum, inferior vermis
PICA
68
blood supp of inferior lateral pons, middle cerebellar peduncle, a strip of the anterior cerebellum between PICA and SCA, including the flocculus
AICA
69
blood supp of Upper lateral pons, superior cerebellar peduncle, most of the superior half of the cerebellar hemisphere, including the cerebellar nuclei and superior vermis
SCA
70

neuro 2nd shift (21 decks)

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