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Cerebellum Function Parts And Anatomy

The cerebellum is the largest part of the hind brain and the second largest part of the brain. It weight about 150g and its located in the Posterior Fossa underneath the tentorium cerebelli and behind the pons and medulla oblongata. It is separated from the pons and medulla by the cavity of the fourth ventricle of hind brain.

Cerebellum Function Parts And Anatomy
Image credit: emedicine.medscape.com

Cerebellum

Its surface is inserted by numerous silt like sulci called fissures. the fissures are like more or less parallel fold called folia. in the general the fissure and folia of the cerebellum lie transversely from side to side across the whole extent of cerebellum.

The cerebellum consist of two hemisphere united by the midline by the vermis.
Each hemisphere of cerebellum is connected to three part of brain stem by the three pair of large fiber tract called cerebellum peduncles. 

Function Of Cerebellum

The basic function of cerebellum are as follows:-
  • Maintain of equilibrium
  • Regulation of muscle 
  • Coordination of somatic matter activities
The cerebellum disease is manifested by Mohor disturbance, including inability to stand upright, staggering gait, hypotonia and failure of coordination.

External Feature Of Cerebellum

External features of cerebellum consist of two surface, two notches, two fissures.


Parts
The cerebellum consist of three parts two large lateral hemisphere lobes the cerebellar hemisphere and a narrow median worm like portion called vermis. the superior and inferior aspect of vermis are termed superior and inferior vermis. the ridge like superior vermis is continuous on either side with the superior surface of cerebellar hemisphere imperceptibly.

The inferior surface vermis is more clearly demerited from the hemisphere in the floor of vallecula cerebelli. 

Surfaces Of Cerebellum

  • The superior surface is convex the two cerebral hemisphere are continuous with each other on this surface.
  • The inferior surface presents a deep median notch called vallecula which separate the two cerebellar hemisphere the floor of vallecula if formed by the inferior vermis and is limited on each side by sulcus vallecula.

Notches of Cerebellum

  • The anterior aspect of cerebellum is marked by a wider shallow anterior cerebellar notch which accommodates pons and medulla.

  • The posterior cerebellar notch is deep narrow and lodges the falx cerebelli.

Fissure Of Cerebellum

  • The horizontal fissure is most conspicuous and run along the lateral. it marked the junction on both the superior and inferior surface of the cerebellum.

  • The V- Shaped fissure prime on the superior surface cuts the superior vermis at the junction of its anterior 2/3 and posterior 1/3. it divides the corpus cerebelli into anterior and posterior lobes.

  • The posterolateral fissure like on the inferior surface of the cerebellum and the separates the flocculonodular lobe from the rest of the cerebellum. 

Subdivision Of Cerebellum

Anatomical subdivision

Three lobe
  • Anterior 
  • posterior 
  • flocculonodular
  • Anterior Lobe:- It lies the superior surface anterior to fissure prima.

  • Posterior Lobe:- It lies both the superior surface of fissure prima at posterolateral on the inferior surface.

  • Flocculondular Lobe:- It is smallest of all and lies on the interior surface in front of posterolateral fissure. 

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