by BOD CASD

External Structure of Cerebellum

External Structure

  • Situated in the posterior cranial fossa
  • Covered superiorly by the tentorium cerebelli = fold of dura mater
  • Lies post. to the pons, medulla oblongata & 4th ventricle
  • Consists of 2 cerebellar hemispheres joined by a narrow median verm
  • 2 surfaces, superior & inferior is
  • Surface of the cerebellum is marked by a series of fissures
  • Cortex folded in ridges called folia; white matter resembles a tree (arbor vitae)

Arbor Vitae

  • In latin “ tree of life” it is the white matter of cerebellum.
  • Tree like appearance.
  • It brings sensory and motor sensation to and from cerebellum.

Main Fissures

3 Main Fissure:

  1. Primary fissure
    – V-shaped fissure
    – Superior surface of cerebellum
  2. Horizontal fissure – Located along the margin of the cerebellum
    – separates the superior from the inferior surfaces
    – Inferior surface of cerebellum
  • The deepest fissures (primary & uvulonodular) divide cerebellum into 3 lobes:

– Anterior lobe
= ant to the primary fissure
– Posterior/middle lobe
= between ant & uvulonodular fissures & Largest
– Flocculonodular lobe

  • Ant & post/middle lobes = formed the corpus cerebelli

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