2.29 Cerebellum Flashcards
3 functional areas of cerebellum
- vestibulocerebellum
- spinocerebellum
- cerebrocerebellum (via dentate nucleus)
vestibulocerebellum has to do with
balance
- equipibrium
- eye movements
- postural muscles
spinocerebellum has to do with
gross movement
cerebrocerebellum has to do with
finer movement
systems that feed into vestibulocerebellum
- visual
- vestibular
outcoems of vestibulocerebellum activation
- eye movements
- postural muscle movement
The vestibulocerebellum is part of this lobe
flocculonodular lobe
spinocerebellum affects these systems
affects both lateral and medial UMN systems
3 main inputs to spinocerebellum
- spinocerebellar internal feedback tracts (spinal cord)
- somatosensory
- sensorimotor
spinocerebellum outputs
- brainstem
- thalamus
spinocerebellum acting on thalamus has effects on
medial and lateral UMN
spinocerebellum is part of the
vermis
cerebrocerebellum and fine movement
- coordination
- planing
- timing
cerebrocerebellum inputs
somatosensory motor cortices » cerebrocerebellum via dentate nucleus
specific receptors for cerebrocerebellum
- GTO
- muscle spindles
- cutaneous mechanoreceptors
cerebrocerebellum outputs
- motor thalamus
- cerebral cortex
cerebrocerebellum outcome
make corrections to movements
cerebrocerebellum is part of the
lateral hemispheres
primary job of cerebellar peduncles
connect cerebellum to everything else
How many cerebellar peduncles?
3
cerebellar peduncles: ratio of afferents to efferents
40:1
What are the 3 cerebellar peduncles?
- inferior
- middle
- superior
inferior cerebellar peduncle receives afferents from
contralateral inferior olivary nucleus (ION)
What does the ION connect?
ION connects spinal cord and brainstem to the cerebellum
Which peduncle is the largest?
middle (has 20 million fibers)
middle peduncle is (afferent/efferent)
afferent
afferent fibers to the middle peduncle come from
pontine nuclei
What does the middle peduncle connect?
cortex to pons to cerebellum
superior peduncle is (afferent/efferent)
efferent
Where does the superior peduncle run?
goes to brainstem and thalamic nuclei
What two things are constantly making modifications to movement?
- cerebellum
- basal ganglia
3 blood supplies to cerebellum
- superior cerebellar artery (SCA)
- anterior inferior cerebellar artery (AICA)
posterior inferior cerebellar artery (PICA)
SCA comes off the
basilar artery
AICA comes off the
basilar artery
PICA comes off the
vertebral arteries
