cerebellum

functions of cerebellum

functions of cerebellum

• coordination of voluntary movements

• balance and body posture

• control of muscle tone

• motor learning / memory

position of the cerebellum

lies in the posterior cranial fossa inferior to the tentorium cerebelli

cerebellum is attached to the _____ by ________

back of the brain stem, three paired bundles of fibers

three paired bundles of fibers attaching the cerebellum

superior, middle and inferior cerebellar peduncles

A

tentorium cerebelli

B

cerebellum

A

superior cerebellar peduncle

B

middle cerebellar peduncle

C

inferior cerebellar peduncle

D

4th ventricle

E

cerebellum

2 cerebellar hemispheres are joined by

a narrow median part called vermis

vermis lies in the

vallecula which is a deep groove on the inferior surface of the cerebellum

tonsil

a partly detached lobule overhanging the inferior vermis on each side

which view of the cerebellum is this

superior view

A

vermis

which view of the cerebellum is this

inferior view

A

vermis

B

vallecula

C

tonsil

A

4th ventricle

B

cortex

C

fissure

D

folium

lobes of the cerebellum

• anterior

• middle (posterior)

• flocculo-nodular

lobes of the cerebellum are separated by

primary and horizontal fissure

primary fissure lies

between the anterior and middle posterior lobes on superior surface of cerebellum

horizontal fissure lies

within middle lobe separating the superior from the inferior surfaces of the cerebellum

A

primary fissure

B

anterior lobe

C

middle lobe

A

flocculo-nodular lobe

B

middle lobe

C

horizontal fissure

functional lobes of the cerebellum

• vestibulocerebellum

• spinocerebellum

• neo-cerebellum

vestibulocerebellum is the

flocculonodular lobe

vestibulocerebellum is connected to

vestibular system

vestibulocerebellum function

maintains equilibrium

spinocerebellum is the

anterior lobe

spinocerebellum is connected to

spinal cord

spinocerebellum function

concerned with unconscious proprioception (muscle tone)

Neocerebellum is

middle lobe

neocerebellum is connected to

cerebral cortex

neocerebellum function

coordination of fine movements

number of cerebellar nuclei

four pairs

largest cerebellar nucleus

dentate nucleus

dentate nucleus is associated with

neocerebellum

other cerebellar nuclei are associated with

spino and vestibulocerebellum

A

dentate nucleus

A

pontine nuclei

B

vestibular nuclei

C

spinal cord

Each cerebellar hemisphere controls the

same side of the body