Exam 3: Motor control circuits

Rule of the cerebellum

cerebellum doesnt initiate movement, it refines it through disinhibition

Why are neurons so much more dense in cerebrum

density of folia

Superior peduncle carries _____ to ______

efferent fibers to UMNs in thalamus, output

Middle peduncle recieves _______ from ____

afferents from pons, cortex input

Inferior peduncle ______ from __________

afferents from spinocerebellar pathway, body input

Molecular layer:

dendrite from PCs

Purkinje cell layer:

Soma of Pcs

granule cell layer

Granule cells and golgi cells

Purkinje cells recieve input from

parallel fibers of GC

granule cells recieve input from

pontine

Granule cells parallel fibers are from _____ to _______

axons to molecular layer

What cell/s excite purkinje cells

granule, climbing fibers

What cells Purkinje cells are inhibitory or excitatory

inhibitory

Climbing fibers recieve input from

medulla

What do golgi cells do

inhibit granule cells

general function of vestibulocerebellum module

balance and eye movement

general function of spinocerebellum module

Gait

general function of cerebrocerebellum module

Fine motor control

Deep cerebellar nuclei

main output center, deep

nystagmus

involuntary bouncing of eye

vestibulocerebellum recieves input from

vestibular aparatus

vestibulocerebellum output to

vestibular nuclei and MAS

Test for vestibulocerebellum

horizontal eye test, postural stability

vestibulocerebellum dysfunction causes

trunk ataxia, nystagmus

Spinocerebellum recieves input from

vermal: vestibular system, paravermal: proprioceptive input

Spinocerebellum output to

vermal: fastigial nucleus, paravermal: interposed nuclei

Spinocerebellum dysfunction causes

gait ataxia

Spinocerebellum can be tested by

heel to toe walking

cerebrocerebelllum input from

cerebral cortex

cerebrocerebelllum output to

dentate nucleus, lateral corticospinal tract

cerebrocerebelllum dysfunction causes

limb ataxia

cerebrocerebelllum test

finger to nose

vestibulocerebellar equation

flocculonodular purkinje cells + vestibular nuclei = balance and eye movemnet

Spinocerebellum equation: vermis

vermis purkinje cells + fastigial nucleus = trunk/posture

Spinocerebellum equation: paravermal

paravermal purkinje cells + glubose emboliform = limb coordination

cerebroceremellum equation

lateral purkinje cells + dentate nucleus = fine motor skills