2.29 Cerebellum Flashcards Preview

7303 Neuroanatomy > 2.29 Cerebellum > Flashcards

Flashcards in 2.29 Cerebellum Deck (35):
1

3 functional areas of cerebellum

- vestibulocerebellum
- spinocerebellum
- cerebrocerebellum (via dentate nucleus)

2

vestibulocerebellum has to do with

balance
- equipibrium
- eye movements
- postural muscles

3

spinocerebellum has to do with

gross movement

4

cerebrocerebellum has to do with

finer movement

5

systems that feed into vestibulocerebellum

- visual
- vestibular

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outcoems of vestibulocerebellum activation

- eye movements
- postural muscle movement

7

The vestibulocerebellum is part of this lobe

flocculonodular lobe

8

spinocerebellum affects these systems

affects both lateral and medial UMN systems

9

3 main inputs to spinocerebellum

- spinocerebellar internal feedback tracts (spinal cord)
- somatosensory
- sensorimotor

10

spinocerebellum outputs

- brainstem
- thalamus

11

spinocerebellum acting on thalamus has effects on

medial and lateral UMN

12

spinocerebellum is part of the

vermis

13

cerebrocerebellum and fine movement

- coordination
- planing
- timing

14

cerebrocerebellum inputs

somatosensory motor cortices » cerebrocerebellum via dentate nucleus

15

specific receptors for cerebrocerebellum

- GTO
- muscle spindles
- cutaneous mechanoreceptors

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cerebrocerebellum outputs

- motor thalamus
- cerebral cortex

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cerebrocerebellum outcome

make corrections to movements

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cerebrocerebellum is part of the

lateral hemispheres

19

primary job of cerebellar peduncles

connect cerebellum to everything else

20

How many cerebellar peduncles?

3

21

cerebellar peduncles: ratio of afferents to efferents

40:1

22

What are the 3 cerebellar peduncles?

- inferior
- middle
- superior

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inferior cerebellar peduncle receives afferents from

contralateral inferior olivary nucleus (ION)

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What does the ION connect?

ION connects spinal cord and brainstem to the cerebellum

25

Which peduncle is the largest?

middle (has 20 million fibers)

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middle peduncle is (afferent/efferent)

afferent

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afferent fibers to the middle peduncle come from

pontine nuclei

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What does the middle peduncle connect?

cortex to pons to cerebellum

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superior peduncle is (afferent/efferent)

efferent

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Where does the superior peduncle run?

goes to brainstem and thalamic nuclei

31

What two things are constantly making modifications to movement?

- cerebellum
- basal ganglia

32

3 blood supplies to cerebellum

- superior cerebellar artery (SCA)
- anterior inferior cerebellar artery (AICA)
posterior inferior cerebellar artery (PICA)

33

SCA comes off the

basilar artery

34

AICA comes off the

basilar artery

35

PICA comes off the

vertebral arteries