Cerebellum - Part 2

Question 1

• interconnections within the cerebellum only
• do not leave the cerebellum
• connect different regions of cerebellum

Answer 1

Intrinsic fibers

Question 2

intrinsic fibers that bridges cerebellar hemispheres

Answer 2

Commisural fibers

Question 3

intrinsic fibers that bridges adjacent structures within the same side

Answer 3

Arcuate/Association fibers

Question 4

• from extra-cerebellar connections
• form the greater part of the white matter and proceed to
the cerebellar cortex
• enter the cerebellum mainly through the inferior and
middle cerebellar peduncles

Answer 4

Afferent fibers

Question 5

• Constitute the output of the cerebellum and commence as the axons of the Purkinje cells of the cerebellar cortex
• Great majority of the Purkinje cell axons pass to and synapse with the neurons of the cerebellar nuclei
• axons then leave the cerebellum
• Some Purkinje cell axons from vermis and flocculonodular lobe bypass the intracerebellar nuclei and immediately leave the cerebellum

Answer 5

Efferent fibers

Question 6

• Composed of large multipolar neurons with simple branching dendrites
• Axons form cerebellar outflow in superior and inferior cerebellar peduncles
• 4 masses of gray matter on each side of the midline

Answer 6

Intracerebellar nuclei

Question 7

4 intracerebellar nuclei

Answer 7

Dentate nucleus
Emboliform nucleus
Globose nucleus
Fastigial nucleus

Question 8

• Largest
• Shaped like a crumpled bag with opening facing medially
• Interior is made up of efferent fibers
• Efferent fibers leave nucleus through opening to form
large part of the superior cerebellar peduncle

Answer 8

DEntate nucleus

Question 9

• Ovoid
• Medial to dentate nucleus
• partially covering the dentate hilus
• Fibers leave the cerebellum through the superior
cerebellar peduncle

Answer 9

Emboliform nucleu

Question 10

• one or more rounded cell groups
• Lie medially to the emboliform nucleus
• Fibers leave the cerebellum through the superior
cerebellar peduncle

Answer 10

Globose nucleus

Question 11

• lies near the midline in the vermis and close to the roof of
the fourth ventricle
• Larger than globose nucleus
• Fibers leave the cerebellum through the inferior
cerebellar peduncle

Answer 11

Fastigial nucleus

Question 12

Influences movements of axis of body (shoulder, neck,

thorax, abdomen, hips)

Answer 12

Cortex of vermis

Question 13

Immediately lateral to the vermis

• Control muscles of distal parts of the limbs (hands, feet)

Answer 13

Intermediate zone

Question 14

• Concerned with planning of sequential movements of the
entire body
• Involved in the conscious assessment of movement and
errors

Answer 14

Lateral zone

Question 15

2 main lines of input to the cortex; excitatory to

the Purkinje cells

Answer 15

Climbing and mossy fibers

Question 16

climbing fibers are terminal fibers of which tract?

Answer 16

olivocerebellar tract

Question 17

Pass through the granular layer of the cortex
and terminate in the molecular layer by dividing
repeatedly

Answer 17

climbing fibers