week 9 Flashcards
What is the function of the cerebellum?
compare actual motor output with intended output and adjusts movement as necessary
What is the input/output of the cerebellum?
input: all brain regions and SC
output: descending projection pathways, major output to red nucleus, primary motor and premotor cortex
What are the different peduncles the cerebellum is attached to the midbrain from?
superior cerebellar: afferent/efferent axons
middle cerebellar peduncle: only afferent
inferior cerebellar peduncles: both efferent and afferent
what are the deep hemspheric nucleii?
dentate, glubose, fastigial, emboliform
What are the cortical layers of the cerebellum?
3 layers
outer and inner layers=interneurons
middle layer= purkinge cell bodies, inhibit deep cerebellar nuclei and vestibular nuclei
what are the afferents to cerebellum?
mossy fibers=from spinal cord, reticular formation, vestibular system, pontine nucleii
climbing fibers-inferior olivary nucleus
what is the cerebellar input for intended movement?
cortex to pontine nucleii to middle cerebellar peduncle
spinal interneurons to internal feedback tracts-anterior spinocerebellar and rostrospinocerebellar tracts
what is the cerebellar input for actual movement?
posterior spinocerebellar tracts and cuneospinocerebellar tracts
function of spinocerebellar tracts
receive proprioception and interneuron activity information for the adjustment of movement
what are high fidelity pathways?
posterior spinocerebellar pathway-LE
cuneocerebellar pathway-UE
Receive somatosensory input regarding actual movement
internal feedback tracts function/tracts
monitor activity of spinal interneurons and of descending motor signals from cerebral cortex
anterior spinocerebellar tract
rostrocerebellar tract
what are the functional divisions of the cerebellum?
spinocerebellum, cerebrocerebellum, vestibulocerebellum
Location/input/output/function of spinocerebellum
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)
Location/input/output/function of cerebrocerebellum
L:lateral hemisphere
I:cortex, pontine nucleii
O:dentate nucleus
F:planning of movement
(fine, distal voluntary movement)
Location/input/output/function of vestibulocerebellum
L:flocculonodular lobe
I:vestibular labyrinth
O:vestibular nucleii
F:maintains balance/control head and eye movement
(equilibrium)
Main output pathway for lateral hemispheres:
dentate nucleus to superior cerebellar peduncle to thalamus and red nucleus
main output pathway for intermediate hemisphere
interposed nuclei to cerebellar peduncle to thalamus and red nucleus
main output pathway to vermis
fastigial nuclei to superior cerebellar nucleus to thalamus, tectum, reticular formation, vestibular nuclei
main output pathway from floccunodular lobe
vestbibular nuclei to juxtarestiform body to medial longitudinal fasiculus
Arterial profusion territory for PICA
lateral medulla and inferior half of cerebellum and inferior vermis
major arterial perfusion for AICA
inferior lateral pons, middle cerebellar peduncle, anterior cerbellum, flocculus
Major arterial profusion for SCA
upper lateral pons, superior cerebellar peduncle, superior cerebellar hemisphere, superior vermis, deep cerebellar nuclei
