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Cerebellum Flashcards

(51 cards)

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1
Q

what happens when there is severe damage to. the cerebellum?

A

it does NOT cause weakness because there are no direct connections between the cerebellum and motor neurons
- causes coordination and postural control deficits

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2
Q

anterior lobe functon

A

coordination of PROXIMAL limbs

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3
Q

posterior lobe function

A

coordination of DISTAL limbs

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4
Q

flocculonodular lobe function

A

balance and eye movements

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5
Q

cerebrocerebellum

A

-motor planning (UE/LE)
-lateral hemisphere
-dentate nucleus

MID

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6
Q

cerebrocerebellum input

A

motor/premotor cortex
pontine nuclei
cross #1: MIDDLE peduncle
contralateral lateral cerebellum

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7
Q

cerebrocerebellum output

A

contralateral lateral cerebellum
dentate nucleus
cross #2: SUPERIOR peduncle
thalamus
motor cortex
L. CST/ Rubrospinal: DISTAL mvmts

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8
Q

spinocerebellum

A

-nonconscious proprioception
-vermis/intermediate hemisphere
-fastigal nucleus, interposed nucleus

NVFI: No Veggies, Fries Instead

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9
Q

vermis function

A

PROXIMAL movements

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10
Q

intermediate hemisphere function

A

DISTAL vol movement

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11
Q

spinocerebellum tracts

A

Dorsal spinocerebellar
cuneospinocerebellar
ventral spinocerebellar
rostral spinocerebellar

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12
Q

Dorsal Spinocerebellar tract

A

function: unconscious proprioception LE

1st order: type Ia (muscle spindles) in LE –> clarks nucleus

2nd order: clark’s nucleus –> INFERIOR peduncles

UNCROSSED

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13
Q

Cuneocerebellar tract

A

function: unconscious proprioception of face, neck UE

1st order: type Ia fibers (muscle spindles) –> lateral cuneate medulla

2nd order: lateral cuneate –> INFERIOR peduncles

UNCROSSED

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14
Q

ventral spinocerebellar tract

A

function: unconscious proprioception LE (reflexes)

1st order: LE type Ib fibers (GTOs) –> DRG

2nd order: DRG –> SUPERIOR peduncle

DOUBLE CROSS
- @ SC level
- cerebellum

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15
Q

rostral spinocerebellar tract

A

function: unconscious proprioception from UE (reflexes)

1st order: UE type Ib fibers (GTOs) –> dorsal horn

2nd order: dorsal horn –> INFERIOR AND SUPERIOR peduncles

UNCROSSED

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16
Q

Spinocerebellum outputs

A

via vermis and intermediate zone

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17
Q

vestibulocerebellum

A

-balance and eye movements
-flocculonodular lobe
-vestibular nuclei

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18
Q

Vestibulocerebellar tract input/afferents

A

vestibular nerve –> vestibular nuclei
–> flocculonodular lobe

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19
Q

vestibulocerebellar tract output/efferents

A

flocculonodular lobe –> vestibular nuclei –> L/M vestibulospinal tracts

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20
Q

M vs. L vestibulospinal tract function

A

m: neck muscles (crosses)
l: extensor muscles (uncrossed)

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21
Q

homunculus: midline vermis

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A

trunk –> truncal/gait instability

22
Q

homunculus: intermediate hemispheres

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A

appendicular muscles–>limb ataxia

23
Q

superior cerebellar peduncle

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A

-mostly efferents (sending info OUT)
-cerebellum –> midbrain

24
Q

middle cerebellar peduncle

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A

-mostly afferents (info coming in)
-pons/superior colliculi –> cerebellum

25
inferior cerebellar peduncle
-afferents: inferior olivary nucleus --> cerebellum -efferents: cerebellum --> vestibulospinal and reticulospinal tracts
26
dentate nucleus
-receives from lateral hemisphere anticipatory movements
27
interposed nuclei
-emboliform and globose - receives from intermediate hemisphere --> DISTAL limb
28
fastigal nuclei
-receives from vermis and flocculonodular lobe -balance, trunk posture, head movements
29
3 layers of cortical gray matter of cerebellum
granular purkinje molecular
30
granular layer associated cells
Golgi cell granule cell
31
Golgi cell
inhibitory interneuron
32
granular cell
excitatory interneuron: excites purkinje cells
32
33
purkinje layer cells
purkinje cell
34
purkinje cell
output cell that INHIBITS deep cerebellar nuclei
35
molecular layer cells
stellate basket
36
stellate/basket cells
inhibitory interneuron: inhibits purkinje fibers
37
Mossy fibers
transmit afferent info (sensory pathways) from SC and pons through excitatory neurotransmitters to cerebellum
38
climbing fibers
transmit afferent info (movement errors) from inferior olivary nucleus to cerebellum
39
what is the effect of mossy fibers exciting granular cells?
increased movement
40
what is the effect of mossy fibers exciting Golgi cells?
decreased movement
41
Superior cerebellar artery
parent: basilar supplies: superior/middle peduncles
42
anterior inferior cerebellar artery
parent: basilar supplies: - middle peduncle - anterior/inferior cerebellum (flocculus)
42
43
posterior inferior cerebellar artery
parent: vertebral supplies: -tonsils -inferior vermis -inferior peduncle
44
Lesion to any part of the cerebellum results in
ataxia
44
Lesions to the vestibulocerebellum result in
Nystagmus unsteadiness truncal ataxia disequilibrium
45
Lesions to the cerebrocerebellum result in
ataxic finger movements dysarthria - slurring of speech
46
If tone is abnormal with cerebellar lesions, will it present as hyper or hypotonia?
hypotonia due to decreased muscle spindle activity
47
Lesions to the spinocerebellum result in
dysarthria scanning speech dysdiadokinesia dysmetria action tremor intention tremor loss of check/rebound movement decomposition
48
movement decomposition
attempting to move 1 joint at a time -. Instead of fluid motion, the movement becomes jerky, segmented, or clumsy

Lauren (103 decks)

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