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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
Q

2 types of neurons found in the molecular layer

A

outer - stellate
inner - basket

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25
Q

these cells are scattered among dendritic arborizations and numerous thin axons that run parallel to long axis of folia

A

stellate and basket

unmyelinated granule axons and purkinje dendrites

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26
Q

what is found in the purkinje layer

A

purkinje cells - golgi type 1

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27
Q

exp the path of purkinje dendrites

A

dendrites pass into molecular layer tas dun sila mag branch out

then spines from synapses c parallels granule cell axons

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28
Q

describe structure of purkinje dendrites

A

primary and second branches are smooth tas yung sunod mga dendritic spines na

29
Q

exp the path of purkinje axons

A

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
Q

what cells are present on the granular layer

A

granular cells and parallel fibers

golgi cells

31
Q

exp dendrites of granular cells

A

each cells gives rise to 4-5 dendrites na claw like and synapse c mossy fiber input

32
Q

exp axons of granular cells

A

each axon pass through molecular later and bifurcates at T-junction = parallel fibers

33
Q

exp parallel fibers of granular cells

A

run parallel to long axis of folium

run at right angles to dendrites of purkinje and synapse c them

34
Q

exp golgi cells in granular layer

A

dendrites nila will ramify in molecular layer

axons terminate c dendrites of granular cells

35
Q

what are the intracerebellar from lateral to medial

A

dentate
emboliform
globose
fastigial

36
Q

what are intracerebellar nuclei

A

mga gray matter embedded in white matter on each side of midline

37
Q

exp axons of intracerebellar nuclei

A

axons form cerebellar outflow in the sup and inf cerebellar peduncles

hence all outputs from cerebellum are relayed by cerebellar nuclei

38
Q

what do intracerebellar nuclei recieves

A

recieve collateral fibers of cerebellar inputs papunta sa cerebellar cortex

39
Q

largest cerebellar nuclei

A

dentate nucleus

40
Q

shape of dentate nucleus

A

crumpled bag c opening facing medially

41
Q

discuss interior of dentate nuc

A

filled c white matter tas may efferents that leaves to form superior cerebellar peduncle

42
Q

what does dentate nuc recieve

A

projections from lateral cerebellar hemisphere

43
Q

when is the dentate nuc active

A

just before voluntary movement

44
Q

ovoid and medial to the dentate

A

emboliform nucleus

45
Q

consists of one or more rounded cells groups medial to emboliform

A

globose nucleus

46
Q

what is the interposed nuc

A

emboliform + globose

47
Q

what does the interposed nuc recieve

A

inputs from intermediate part of cerebellar hemisphere

48
Q

when is interposed nuc active

A

during and in relation to movement

49
Q

found near midlines in vermis and close to roof of 4th vent

A

fastigial nucleus

50
Q

what does the fastigial nucleus recieve

A

input from vermis and flocculonodular lobe

51
Q

what fibers project to vestibular nuclei

A

most of fibers leaving inferior vermis and floccule

52
Q

what is arbor vitae

A

small amount of white matter in vermis - like branches of tree

53
Q

what are the 3 groups of white matter in cerebellar hemisphere

A

intrinsic
afferent
efferent

54
Q

discuss intrinsic white matter

A

does not leave cerebellum

connects diff regions ng vermis or cortex or the hemispheres

55
Q

discuss afferent white matter

A

from greater part of WM then proceed to cerebellar cortex

enter through inferior and middle cerebellar peduncles

56
Q

discuss efferent white matter

A

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
Q

axons that leave via SCP

A

axons from dentate, emboliform and globose

58
Q

fibers that leave via ICP

A

fastigial nuc

59
Q

fibers that leave juxtarestiform body

A

vestibular nuc

60
Q

brachium conjunctivum

61
Q

brachium pontis

62
Q

restiform body

63
Q

forms the wall of 4th ventricle

A

cerebellar peduncles

64
Q

carries mainly output from cerebellum

65
Q

where does SCP decuss

A

level of inferior coll

66
Q

carries mainly input from cerebellum

A

MCP and ICP

67
Q

blood supp of lateral medulla, inferior half of cerebellum, inferior vermis

68
Q

blood supp of inferior lateral pons, middle cerebellar peduncle, a strip of the anterior cerebellum between PICA and SCA, including the flocculus

69
Q

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

neuro 2nd shift (21 decks)

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