1. Cerebellum Structure and Function

2. Cerebellum Definition
An organ concerned with the coordination of the voluntary movements
It maintains posture and balance
Situation
Behind pons varolii
Below the posterior portion of cerebrum
In the posterior cranial fossa

3. Structure Ovoid in shape Two hemispheres
Seaparated by vermis a median strip of tissue
Grey matter forms the surface
White matter in depth
Cerebellum communicates with other regionof the CNS through three large nerve tracts called the cerebellar peduncles
The cerebellum consists of following three parts

4. PARTS
CONTROL
flocculonodular
Balance and maintenance of muscle tone
Vermis – anterior part
Motor coordination and muscle tone
Vermis – posterior part and lateral hemispheres
Fine motor coordination and muscle tone

5. Funtions
Coordination of groups of voluntary muscles so that movements are smooth, even and precise
Maintenance of body posture
Coordination of activities associated with the maintenance of the balance and equilibrium of body.
Cerebellar activities are carried out below the level of consciousnes i.e. not under voluntary control

6. Sensory input for cerebellum
Derived from
Muscles and joints
Eyes
Ears (from semicircular canals)

7. Applied anatomy Cerebellar dysfunction may cause
Decreased muscle tone,
Imbalance and
Lack of co-ordination

8. Lobules of vermis and brain stem anatomy 1.Lingula 2. central lobule 3. culmen 4. declive 5. folium 6. tuber 7. pyramis 8. uvula 9. nodulus A. midbrain B.pons C. medulla D. cerebral aqueduct E. fourth ventricle F. primary fissure G. posterolateral fissure