QS Study

The cerebellum is one of the most special parts of the brain due to its unique form and location. It is the part of the brain involved in the higher levels of thinking and action. It is involved in the control of voluntary and involuntary movement as well as balance. The cerebellum is located behind the top part of the brain stem and is made of two hemispheres.

Functional parts of the cerebellum

(1) Archicerebellum: It is the oldest part of the cerebellum. It is made up of flocculonodular lobe and lingula.

Function – Facilitates a smooth, coordinated voluntary movement.

(2) Paleocerebellum: It is the next part to appear. It is made up of anterior lobe except for lingula, pyramid and uvula of the inferior vermis.

Function:

  • Plays an active role in the performance of voluntary movement.
  • Helps in the maintenance of posture by maintaining muscle tone.

(3) Neocerebellum: Latest and newest part to develop. Made up of middle lobe except for pyramid and uvula of the inferior vermis.

Function: Assists in maintaining equilibrium by modifying muscle tone.

Functional Parts of Cerebellum 1

Fig: Functional Parts of Cerebellum

Functional Divisions

The cerebellum can also be divided by function. There are three functional areas of the cerebellum – the cerebrocerebellum, the spinocerebellum and the vestibulocerebellum.

Cerebrocerebellum – It is involved in planning movements and motor learning. It receives inputs from the cerebral cortex and pontine nuclei and sends outputs to the thalamus and red nucleus.

Spinocerebellum – It is involved in regulating body movements by allowing for error correction. It also receives proprioceptive information.

Vestibulocerebellum – It is involved in controlling balance and ocular reflexes, main fixation on a target. It receives inputs from the vestibular system and sends outputs back to the vestibular nuclei.

Functions of the cerebellum:

  • It coordinates voluntary movements so that they are smooth, balanced and accurate.
  • It controls tone, posture and equilibrium.
Related Study: