Cerebellar dysfunction

Question 1

Superior cerebellar peduncle

Answer 1

• Connects cerebellum to the midbrain

- contains cerebellar efferent fibers

Question 2

Middle cerebellar peduncle

Answer 2

• attaches to the pons

- contains afferent fibers from the cerebral cortex

Question 3

inferior cerebellar peduncle

Answer 3

• attaches to the medulla
• contains afferent fibers from the brain stem and SC
  and efferent fibers to the vestibular and reticular nuclei in the brainstem

Question 4

cerebellar pathways

Answer 4

• mostly ipsilateral

- vestibulocerebellum has some bilateral control

Question 5

input vs output fibers

Answer 5

• input: mossy fibers (information and climbing fibers (timing
• output: purkinje cells

Question 6

Vestibulocerebellum

Answer 6

• regulates equilibrium
• inputs: vestibular nuclei and superior colliculus (eye and head position/movement)
• output: medial vestibular nucleus (VOR and eye-head coordination). Lateral vestibular nucleus, reticulospinal system, primary motor cortex (postural reactions)
• deep cerebellar nucleus: fastigial

Question 7

spinocerebellum

Answer 7

• regulates gross limb movements
• input: spinocerebellar tracts
• outputs: vestibulospinal and reticulospinal tracts. Motor cortex and red nucleus.
• deep cerebellar nuclei: emboliform and globose