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cerebrocerebellum
lateral cerebellar hemispheres
dentate nucleus
spinocerebellum
vermis and intermediate hemispheres
interposed nuclei
vestibulocerebellum
flocculus and noddulus
vestigal nuclei
function of cerebrocerebellum
precise rapid limb movement
augmentation of tasks requiring dexterity
movement initiation
motor learning
function of vestibulocerebellum
balance, coordination of eye and hand movement, control axial muscles/proximal stability
function of spinocerebellum
execution of limb movement; fine tuned motor control (interposed nuclei)
muscle tone regulation (fastigial nucleus)
deepest layer of cerebellar cortex
granule cell layer
middle layer of cerebellar cortex
purkinje cell layer
most superficial layer of cerebellar cortex
molecular layer
function of climbing fibers
involved in motor learning
arise from inferior olivary nucleus
excitatory to purkinje fibers, thus inhibitory to deep cerebellar nuclei
climbing fibers
change firing rate while learning new movements
function of mossy fibers
bring in sensory information and information form other motor areas
indirectly excites Purkinje cells via granule cell
vestibulocerebellum lesion
balance and righting problems
spinocerebellum lesion
ipsilateral hypotonic muscle
spinocerebellum lesion
ipsilateral coordination difficulties
ataxia, dysmetria, dysarthria, intention tremors
ataxia
overshooting, jerky movements
dysmetria
ataxia where judgement of distance is off
dysarthria
motor speech problem, understand but can’t mouth the words
intention tremor
when intending to do a task, there is a fine tremor
cerebrocerebellum lesion
rapid alternating movements
cerebrocerebellum lesion
problems with motor learning
cerebellar double cross
accounts for ipsilateral distal signs with a cerebellar lesion