Cerebellum Flashcards
cerebellum
adjusts output of UMN pathwayscontrol rate, range, and force of ongoing motor movementsmaintenance of stable postureplanning and timing of complex movement
rate, range, and force
coordinationof ongoing movements
what cerebellum does NOT do
issue motor commands-Dx not chacterized by paresis or paralysisdoes not act in awarenessno loss of conscious sensory function
folia
gyri of the cerebellum
vermis
medial region of cerebellum
cerebellar hemispheres
left and right
primary fissure
splits anterior and posterior lobes of cerebellum
lobes
anterior/posteriorbest identifed by mid-sagittal view
nodulus
viewed anteriorly, part of the vermisattached to two flocculi
flocculonodular lobe
nodulus and two flocculi
tonsil
viewed anteriorly, below the noduluscan be moved to foramen magnum with increased ICP
blood supply of cerebellum
superior cerebellar arteriesanterior inferior cerebellar arteriesposterior inferior cerebellar arteries
cerebellar peduncles
inferior - inputmiddle - inputsuperior - outputall medially
inferior peduncles
cerebellar input-spinocerebellar tracts-vestibular input and from olive
middle peduncles
ALL input-pontocerebellar fibers
superior peduncles
cerebellar output
cell bodies of cerebellum
externally
arbor vitae
white matter to and from cerebellar cortex–looks like tree
outer cerebellar cortex
lots of cell processes-inner cerebellar cortex - cell bodies
molecular layer
outer cerebellar cortex
purkinje neurons
make up purkinje cell layer-one cell thick, nice line-huge dendritic trees-huge cell bodydeep to molecular layerabove granule cell layer
granule cell layer
just above the arbor vitae
cerebellar hemispheres control
ipsilateral body
brodmans areas 4 and 6 and 8
equivalent to primary, supplementary, and premotor cortices