Cerebellum - Pathways

Question 1

What tracts pass through the ICP (restiform body)?

Answer 1

Afferents:

• Post. or dorsal spinocerebellar t. (Flechsig’s t.)
• Cuneocerebellar t.
• Vestibulocerebellar t.
• Olivocerebellar t. - decussation
• Reticulocerebellar t.
• Trigeminocerebellar t. or nucleocerebellar t. - crossed and uncrossed
• Arcuatocerebellar t.
• Rostral spinocerebellar t.

Efferents:

• Cerebellovestibular t. (cerebellofugal fibers)
• Cerebellospinal t.
• Cerebello-olivary t.
• Cerebelloreticular t.

Question 2

What tracts pass through the MCP (brachium pontis)?

Answer 2

Afferent:

Temporopontine t. (Türck’s bundle) and frontopontine t. (Arnold’s bundle) terminate in the pontine nuclei (1st order neurons)

• Pontocerebellar t. or corticopontocerebellar t. (2nd order neurons) - decussation

Question 3

What tracts pass through the SCP (brachium conjunctivum)?

Answer 3

Afferents:

• Ant. or ventral spinocerebellar t. (Gower’s t.) (the only afferent bundle entering SCP) - 2 times decussation (ipsilateral)
• Tectocerebellar t. (not sure)

Efferents:

• Cerebellothalamic t. - decussation
• Dentatorubral t. or cerebellorubral t. - decussation
• Cerebellotegmental t. - decussation
• Cerebelloreticular t. - decussation
  
  • Then reticulospinal t.
• Cerebello-olivary t. (not sure)
• Cerebellovestibular t. (not sure)