Motor control: cerebellum

Question 1

what are 3 functional output lobes of the cerebellum and their functions

Answer 1

1. spinocerebellum - descending motor systems
2. cerebrocerebellum - motor planning and fine movements
3. vestibulocerebellum - to vest. nuc for balance and eye movements

Question 2

what are 4 input regions of cerebellum

Answer 2

1. corticopontine
2. spinal
3. visual/auditory
4. vestibular

Question 3

what input is received from the cortex

Answer 3

planned movement info

Question 4

what 3 other area does the cerebellum get info from

Answer 4

1. visual and aut - colliculi
2. vestibular apparatus
3. proprioceptors

Question 5

where does cerebellum output go (2)

Answer 5

1. extraoccular for eye movements

2. medial and lateral descending paths for movement

Question 6

** what happens for fine motor movements

Answer 6

decussates from cerebellum to dentate nucleus and decussates back to body (same side damage)

Question 7

3 brainstem lesions that can mimick cerebellar

Answer 7

1. midbrain at level of sup. colliculus
2. lesion of lateral pons including cerebellar peduncle
3. lesion of lateral aspoct of rostral medulla

Question 8

** 5 key Sx of cerebellar lesions

Answer 8

1. ataxia
2. dysmetria
3. intention tremor
4. dysdiadokinesia
5. nystagmus

Question 9

what is ataxia

Answer 9

staggering wide base. lurching

Question 10

what is dysmetria

Answer 10

failure in coordinating accuracy of movements - finger nose test

Question 11

what is dysdiadokinesia

Answer 11

failure to maintain rate of movement - slow clap

Question 12

what is nystagmus

Answer 12

back and forth eye movements