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Neuro 3 > Cerebellum > Flashcards

Cerebellum Flashcards

1
Q

Cerebellum does

A

Motor planning
Balance, postural adjustment
Correction of ongoing voluntary movements

Also gets non con propripoception from muscle spindles and golgi tendons

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2
Q

Fissures

A

Primary - separates anterior and posterior

Posterolateral - separates body from flocculonodular lobe

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3
Q

Medial and lateral regions

A

Vermis - lungula rostral and nodule caudal

Lateral - hemispheres with an intermediate and lateral part

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4
Q

Efferents from cerebellum

A

Superior - to contralateral thalamus and contralateral brainstem (red nucleus and vest nuclei_)

INferior - ipsilateral brainstem (minimal to vestib nuclei)

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5
Q

Superior and middle affarents

A

Sup - from ipsi spinal cord (ASCT)

Middle - from contralateral cortex via pontine nuclei (pontocerebellar tract)

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6
Q

Inferior affarents

A

Ipsi spinal cord (PSCT)

Ipsi BS - Lateral cuneate nucleus, vestibular nuclei, RF

Contra BS via inferior olive

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7
Q

Molecular layer `

A

Parallel fibers = axcons of granule cells
Dendrites of underlying P cells
Stellate and basket cells carry inhibitory tone

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8
Q

Purkinje layer

A

Purkinje cell bodies (GABA)…2D

Sole output of cerebellar cortex to white matter of cerebellum

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9
Q

Granular layer

A

Granule cells - excitatory to all other kinds of cells…become parallel fibers
A few larger golgi cells (GABA)

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10
Q

Layers of input for pons, spinal cord, brainstem, IO

A

All go to granular later granule cells except for IO (climbing fibers) that go straight to Purkinje cells

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11
Q

Mossy fibers and sources

A

Rgulate Purkinje neurons indirectly via synaptic contact with granule cells and paralell fibers

Contralateral pontocerebellar
Ipsi Spinocerebellar, cuneocerebellar, vestbiulocerebellar, reticulocerebellar

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12
Q

Climbing fibers and sources

A

Regulate Purkinjie neurons via direct contract

Contralateral IO as olivocerebellar

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13
Q

IO affarnets

A

Cortex
RN
Contralateral spinal cord (primary from muscle spindles)

Compares motor info from RN and cortext operiphery

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14
Q

IO efferents

A

Olivocerebellar fibers to the inferior cerebellar peduncle which modify efficiency and produce LT changes in cerebellar iutput

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15
Q

Nuclei of the spinal cord from lateral to medial and inputs

A

Dentate - Inputs from cortex via pontine

Interposed - inputs from spinal cord and lateral cuneate nucleus

Fastigial nucleus - inputs from VN, RF

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16
Q

Functional divisions from lateral to medial and attached nuclei

A

Cerebrocerebellum (dentate)…lateral hemispheres
Spinocerebellum (interposed and fastigial)…inclues intermediate and vermis
Vestbiulocerebellum (fastigial)…flocculonodular lobe

17
Q

Cerebrocerebellum function and affarents

A

Motor planning and coordination of movements…firing changes before voluntayr movements occur

Contralateral corticopontocerebellar inputs via the middle cerebellar peduncles

18
Q

Cerebrocerebellum efferent

A

Output from dentate nucleus to contralateral cortex…dentate - DSCP - thalamus (VL) - cx (motor)

Then from cortex to contralateral spinal cord via lateral corticospinal tract

19
Q

Spinocerebellum IM portion function and afarent

A

Regulates limb adjustments…non con from spindles and golgi tendons…firing changes during movement

Posterior and anterior spinocerebellar tracts to interposed nucleus

Cuneocerebellar tract to interposed nucleus

20
Q

Efferent of spinocerebellum IM portion

A

From interposed nucleus to lateral descending ystems

Interposed - DSCP - thalamus (VL) - cx - PD - spinal cord = lateral corticospinal tract (same as cerebrocerebellum)

Also, interposed - DSCP - red nucleus (magno) - MD crossing - spinal cord = rubrospianl tract (facilitates flexor and inhibits extensors)

21
Q

Spinocerebellum (Vermis) function and afferents

A

Regulates postural adjustments

Affarents from posterior and anterior spinocerebellar tracts below T6 to fastigial

and cuneocerebellar tracts above T6 to fastigial

22
Q

Efferents of spinocerebellum (vermis)

A

Fastigial nucleus to medial descending systems

Fastigial - DSCP - thalamus (VL) - cx - spinal cord = ventral corticospinal

Fastigial - RF - spinal cord = reticulospinal tract (extensor of vertebral column)

23
Q

Vestibulocerebellum function and affarent

A

Balance and head movement

Primary via vestbiular ganglion from semicircular canals and otolith organs

Seocndary via vestibular nuclei

24
Q

Efferents of vestbiulocerebellum

A

From fastigial to spinal cord via VN

Lateral - to facilitate extensor of axial region

Med - to facilitate neck muscles for head positioning

25
Q

Tracts associated with cerebrocerebellum, spinocerebellum, and vestbiulocerebellum

A

Cerebro - lateral corticospinal

Spino - Rubro and lateral corticospinal (interposed) and vestbiulospinal, reticulospianl, and ventral corticospinal (fastigial)

Vestbiulocerebellum - medial and lateral vestbiulospainal

26
Q

Functions of cerebrocerebellum, spinocerebellum, and vestbiulocerebellum

A

Motor planning and coordiation

Interposed - motor adjustment of distal limbs

Fastigail - motor adjustment of axial and proximal

Vestbiular - balance and nead movements

27
Q

Blood supply of cerebellum

A

PICA - posterior
AICA - flocculonodular lobe
SCA- anteiro

Vertebral system

28
Q

Cerebrocerebellum lesion

A

Could be from PICA stroke

Neocerebellar syndrome - dysmetira, terminal tremor, and dysdiadochokinesia

29
Q

Spinocerebellum lesions

A

Could be from SCA stroke

Anterior lobe syndrome - common in alcoholics

Decreased muslce tone and postural instability

Broad based gait, ataxia, dose NOT imporve if laying down

30
Q

Vestibulocerebellu, lesion

A

Could be from AICA

Affects balance

Ataxic gate and wide based stance but imporoves if lying down…also no hx of alcohol

Neuro 3 (31 decks)

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