cerebellum Flashcards
is the cerebellum a UMN
no
supratentorial
upper portion of the brain
does not include the cere
for higher order processes- like thinking
Cerebellum: Coordination
the cere coordinates posture and movement
timing, direction, speed and rate of change in force; adjusting and matching to intent of movement
Cerebellum Current control
continuous comparison of performance to internal models of intended action
Knowledge of results cere
use of feedback to revise future output over a number of trials
Synergy
control of multiple muscle simultaneous
and/or
sequential activation for a patterned movement or postural control
role of the cerbellum
example of a synergist group
agonist, synergist and antagonist
Flocculonodular Lobe functional divsion
Vestibulocerebellum
Flocculonodular Lobe assocciated deep nucelus
Vestibular Nuclei
Flocculonodular Lobe role
Balance Adjustments, Eye Movements in response to vestibular inputs
Vermis and Paravermal Areas
functional divsions
Spinocerebellum
Vermis and
Paravermal Areas associated deep nueclei
Fastigial /
Interposed (globose/emboliform)
Vermis and Paravermal Areas role
Postural control, Coordination during execution of a motor act
Cerebellar Hemispheres functional divsion
Cerebrocerebellum
Cerebellar Hemispheres associated deep nuclei
Dentate
Cerebellar Hemispheres role
Refining voluntary movement;
Motor Planning
Inferior cerebellar peduncle is afferent or efferent
afferent
ICP afferent pathway
spinal inputs and inferior olivary nucleus fibers to spinocerebellum
Middle cerebellar peduncle afferent or efferent
afferent
MCP pathway
cortex > pontine nuclei >cerebrocerebellum
Superior cerebellar peduncle efferent or afferent
both
more efferents then afferents
SCP efferent pathway
from cerebrocerebellum to red nucleus and ventral lateral nucleus (of thalamus), back to cortex
SCP afferent pathway
spinal input (Ventrospinocerebellar)tocerebrocerebellum
Three layers to the cortex/gray matter of the cere
Molecular layer
Purkinje cell layer
Granule cell layer
White matter: two sources of afferent input
Mossy fibers
Climbing fibers
where do we find Climbing fibers
inferior olivary nucleus
Inferior cerebellar peduncle- what information
Vestibular afferents
Spinocerebellartract fibers: dorsal (DCST)and cuneo(CCT)
Climbing fibers from inferior olivary nucleus (olivocerebellar fibers)
Middle cerebellar peduncle - what info
Cerebro-pontocerebellar fibers from pontine nuclei
Cerebrocerebellar lesion
Decomposition planned motor acts
Altered reaction time and movement paths
Efferents from cerebrocerebellum via what nuecleus
via dentate nucleus
Efferents from cerebrocerebellum projecct to
cerebral cortex
Efferents from cerebrocerebellum functions
inmovement planning, ‘starts and stops planned together’, timing of muscles in motor act, other cognitive functions
