week 9

Question 1

What is the function of the cerebellum?

Answer 1

compare actual motor output with intended output and adjusts movement as necessary

Question 2

What is the input/output of the cerebellum?

Answer 2

input: all brain regions and SC
output: descending projection pathways, major output to red nucleus, primary motor and premotor cortex

Question 3

What are the different peduncles the cerebellum is attached to the midbrain from?

Answer 3

superior cerebellar: afferent/efferent axons
middle cerebellar peduncle: only afferent
inferior cerebellar peduncles: both efferent and afferent

Question 4

what are the deep hemspheric nucleii?

Answer 4

dentate, glubose, fastigial, emboliform

Question 5

What are the cortical layers of the cerebellum?

Answer 5

3 layers
outer and inner layers=interneurons
middle layer= purkinge cell bodies, inhibit deep cerebellar nuclei and vestibular nuclei

Question 6

what are the afferents to cerebellum?

Answer 6

mossy fibers=from spinal cord, reticular formation, vestibular system, pontine nucleii
climbing fibers-inferior olivary nucleus

Question 7

what is the cerebellar input for intended movement?

Answer 7

cortex to pontine nucleii to middle cerebellar peduncle
spinal interneurons to internal feedback tracts-anterior spinocerebellar and rostrospinocerebellar tracts

Question 8

what is the cerebellar input for actual movement?

Answer 8

posterior spinocerebellar tracts and cuneospinocerebellar tracts

Question 9

function of spinocerebellar tracts

Answer 9

receive proprioception and interneuron activity information for the adjustment of movement

Question 9

what are high fidelity pathways?

Answer 9

posterior spinocerebellar pathway-LE
cuneocerebellar pathway-UE
Receive somatosensory input regarding actual movement

Question 10

internal feedback tracts function/tracts

Answer 10

monitor activity of spinal interneurons and of descending motor signals from cerebral cortex

anterior spinocerebellar tract
rostrocerebellar tract

Question 11

what are the functional divisions of the cerebellum?

Answer 11

spinocerebellum, cerebrocerebellum, vestibulocerebellum

Question 12

Location/input/output/function of spinocerebellum

Answer 12

L:intermediate hemisphere
I:spinal cord, inferior olivary nucleii
O:fastigial, globose, emboliform nucleii
F:posture and movement of trunk/limbs
(composed of vermis and paravermal cortex)
(gross limb movement)

Question 13

Location/input/output/function of cerebrocerebellum

Answer 13

L:lateral hemisphere
I:cortex, pontine nucleii
O:dentate nucleus
F:planning of movement
(fine, distal voluntary movement)

Question 14

Location/input/output/function of vestibulocerebellum

Answer 14

L:flocculonodular lobe
I:vestibular labyrinth
O:vestibular nucleii
F:maintains balance/control head and eye movement
(equilibrium)

Question 15

Main output pathway for lateral hemispheres:

Answer 15

dentate nucleus to superior cerebellar peduncle to thalamus and red nucleus

Question 16

main output pathway for intermediate hemisphere

Answer 16

interposed nuclei to cerebellar peduncle to thalamus and red nucleus

Question 17

main output pathway to vermis

Answer 17

fastigial nuclei to superior cerebellar nucleus to thalamus, tectum, reticular formation, vestibular nuclei

Question 18

main output pathway from floccunodular lobe

Answer 18

vestbibular nuclei to juxtarestiform body to medial longitudinal fasiculus

Question 19

Arterial profusion territory for PICA

Answer 19

lateral medulla and inferior half of cerebellum and inferior vermis

Question 20

major arterial perfusion for AICA

Answer 20

inferior lateral pons, middle cerebellar peduncle, anterior cerbellum, flocculus

Question 21

Major arterial profusion for SCA

Answer 21

upper lateral pons, superior cerebellar peduncle, superior cerebellar hemisphere, superior vermis, deep cerebellar nuclei