Cerebellum

Question 1

Cerebellum

Answer 1

• dorsal to BS –> lobes of folded cortex
• attached to pons via cerebellar peduncles
  Function:
  1) Coordinates complex mov’ts
  2) monitors mm to ensure fluid mov’t
  3) receives sensory input from body/CNS
  4) influences motor function thru thalamus and motor cortex
  OUTPUT = Purkinje cells
  Blood supply:
  1) Most = Basilar (anterior inferior, superior cerebellar aa)
  2) Inferior = posterior inferior cerebellar a

Question 2

Anterior and Posterior Lobes

Answer 2

Anterior:
Location = superior to posterior lobe
Function = mediate unconscious proprioception
Posterior:
Location = caudal to primary fissure, larger
Function = fine motor coordination

Question 3

Superior Peduncle

Answer 3

Location = attaches cerebellum to midbrain
Function:
1) efferent fibers (axons) that send feedback to motor cortex in frontal lobe
2) afferent fibers take proprioceptive info from lower body to cerebellum

Question 4

Middle Peduncle

Answer 4

Location = largest peduncle, links cerebellum with the pons
Function = sends copy of info for m mov't for lower motor neurons to brain

Question 5

Inferior Peduncle

Answer 5

Location = connects cerebellum with medulla
Function = entrance site of proprioceptive info for cerebellum

Question 6

Flocculonodular

Answer 6

• base of cerebellum, comprised of flocculus and nodulus

Function = maintain equilibrium

Question 7

Vermis

Answer 7

• midline of cerebellum
• divides paravermal and lateral hemispheres
  Function = body posture and locomotion

Question 8

Horizontal Fissure

Answer 8

• extends around dorsolateral border of each hemisphere from middle cerebellar peduncle
• divides cerebellum into upper and lower portions
• largest and deepest fissure in cerebellum

Question 9

Primary fissure

Answer 9

• deepest fissure in vermis
• curves ventrolaterally in superior surface of cerebellum to meet horizontal fissure
• divides cerebellum into anterior and posterior lobes