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Neuro > Cerebellum + Input Pathways > Flashcards

Cerebellum + Input Pathways Flashcards

1
Q

list the 5 main roles of the cerebellum

A
  • coordination
  • balance + equilibrium
  • muscle tone
  • motor control
  • motor learning
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2
Q

what region of the skull is the cerebellum found in?

A

posterior fossa

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3
Q

the cerebellum is dorsal to the ____

A

midbrain

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4
Q

the cerebellum is in the same area as the ____

A

4th ventricle

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5
Q

the vermis separates…

A

lateral hemispheres of the cerebellum

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6
Q

the anterior and posterior lobes are separated by the…

A

primary fissure

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7
Q

describe folia

A
  • Similar to gyri of the cortex, but smaller and less defined
  • Run medial to lateral
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8
Q

flocculonodular lobe

A

flocculus and nodulus

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9
Q

posterolateral fissure

A

separates flocculonodular lobe from posterior lobe

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10
Q

what is the only cerebellar peduncle that goes contralateral, and where does it decussate?

A
  • SCP

- decussates in caudal midbrain at level of inferior colliculi

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11
Q

cerebrocerebellum

A
  • Input to/from cortex

- Involved in planning and initiation of movement

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12
Q

spinocerebellum (vermis)

A
  • Input to/from spinal cord

- Posture, proximal limb movement, eye movement

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13
Q

spinocerebellum (intermediate zone)

A
  • Input to/from spinal cord

- Integrates input regarding appendicular limb position and somatosensory

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14
Q

vestibulocerebellum

A
  • Input to/from vestibular labyrinth

- Maintenance of equilibrium, balance, and posture

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15
Q

climbing fibers

A

excitatory fibers from contralateral inferior olivary nucleus that synapse with deep cerebellar nuclei and Purkinje cells

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16
Q

T/F: a single climbing fiber can synapse with multiple Purkinje cells

A

true

17
Q

mossy fibers

A

excitatory fibers from all areas of afferent input (besides inferior olivary)

18
Q

what types of cells do mossy fibers synapse with?

A
  • Deep cerebellar nuclei
  • Granule cells → Parallel cells → Purkinje cells
  • Golgi cells
19
Q

pontocerebellar fiber pathway

A

Cortex → internal capsule → ipsi pontine nuclei → mossy fibers (decussate prior to entering contra MCP) → cerebellar cortex

20
Q

input from the pontocerebellar fibers comes from where?

A
  • Mostly PSC, PMC, and visual cortex

- Some from vestibular and auditory

21
Q

Olivocerebellar fiber pathway

A

Red nucleus, cortex, brainstem, SC → inf olivary nucleus via central tegmental tract → climbing fibers (decussate prior to entering contra ICP) → cerebellar cortex

22
Q

what info comes from the dorsal spinocerebellar tract?

A
  • Afferent info about LE limb movements

- Subconscious perception from intrafusal fibers and joint receptors

23
Q

dorsal spinocerebellar pathway

A

LE proprioceptors → 1° peripheral neuron → Nucleus Dorsalis of Clark (synapse at C8-L2/3) → 2° neuron travels up SC to brainstem → gives way to mossy fibers → travels through ICP → cerebellar cortex

24
Q

what info comes from the cuneocerebellar tract?

A
  • Afferent info about UE/neck movements

- Subconscious perception from intrafusal fibers and joint receptors

25
Q

cuneocerebellar pathway

A

UE/neck proprioceptors → 1° peripheral neuron → external cuneatus nucleus (medulla) → 2° neuron travels up SC to brainstem → gives way to mossy fibers → travels through ICP → cerebellar cortex

26
Q

what info comes from the ventral spinocerebellar tract?

A

Info re: activity of LE SC interneurons from intrafusal fibers and GTOs

27
Q

what info comes from the rostral spinocerebellar tract?

A

Info re: activity of UE/neck SC interneurons from intrafusal fibers and GTOs

28
Q

ventral/rostral spinocerebellar pathway

A

LE/UE proprioceptors → 1° peripheral neuron → spinal interneurons → 2° decussate at spinal level via anterior commissure and ascend via ventral/rostral spinocerebellar tracts to rostral midbrain → decussate again via SCP → cerebellar cortex

29
Q

all cerebellar output comes from the ____ fibers and travels through ____ or ____ nuclei

A
  • Purkinje
  • deep cerebellar
  • vestibular
30
Q

what are the 3 deep cerebellar nuclei?

A
  • dentate
  • interposed (emboliform + globose)
  • fastigal
31
Q

dentate nuclei receive projections from…

A

lateral cerebellar hemispheres

32
Q

interposed nuclei receive projections from…

A

intermediate cerebellar hemispheres

33
Q

fastigal nuclei receive projections from…

A

vermis and part of flocculonodular lobe

34
Q

vestibular nuclei receive projections from…

A

inf vermis and majority of flocculonodular lobe

Neuro (7 decks)

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