Friday 25 October 2013

Cerebellum

  • Primary function is to evaluate how well movements initiated by motor areas are actually being carried out eg coordination of movement
  • Cognition (acquisition of knowledge) eg learning from mistakes and feedback loop through thalamus
  • Regulates balance and posture
  • Found in the posterior fossa, inferior to the occipital lobe.

Three Areas:

Vestibulocerebellum
- Found on the inferior surface in the Flocculonodular (flok-u-lo-NOD-u-lar) lobe
- Receives vestibular and visual input
- Contributes to equilibrium and balance
- A lesion in this area results in disturbances in posture and gait

Spinocerebellum
- Found in the centre in the vermis
- Receives proprioceptive input

Cerebrocerebellum
- Found in the lateral hemispheres (anterior and posterior lobes)
- Governs subconscious aspects of skeletal muscle movements, ensuring a smooth orderly sequence of muscle contraction

Input and output is via the three pairs of large tracts known as the superior, middle and inferior peduncles.Dysfunction of the cerebellum will result in the inability to perform smooth directed movements, eg ataxia, kinetic tremor dysmetria (inaccuracy)

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