Cerebellum

Question 1

What tracts lie in the inferior cerebellar peduncle? Afferent or efferent?

Answer 1

Juxtarestiform body (afferent and efferent)

Restiform body (afferent)

Question 2

What tracts lie in the middle cerebellar peduncle? Afferent or efferent?

Answer 2

Corticopontocerebellar pathway (afferent)

Question 3

What tracts lie in the superior cerebellar peduncle? Afferent or efferent?

Answer 3

Ventral spinocerebellar pathway (afferent)

Int. Zone to VL/VPL to red nucleus (and other grey matter) (efferent)

Lat. Zone to dentate nucleus to VL/VPL to Area 4 (efferent)

Question 4

What is the juxtarestiform body?

Answer 4

vestibulocerebellar pathway: vestibular nucleus to the fastigial nucleus of the flocculonodular lobe

this pathway is both afferent and efferent

Question 5

What comprises the restiform body?

Answer 5

Olivocerebellar Pathway

Reticulocerebellar pathway (reticular nucleus to the vermis)

Dorsal Spinocerebellar Pathway

Question 6

What is the center of the functional unit of the cerebellum?

Answer 6

Purkinje Cells

Question 7

What are the layers of the cerebellum? What cells reside in each?

Answer 7

Molecular: basket and stellate

Purkinje: purkinje cells

Granular: granule and Golgi type II cells

Question 8

What are climbing fibers?

Answer 8

inferior olivary complex to purkinje and deep nuclear cells

excitatory

Question 9

What are mossy fibers?

Answer 9

excitatory

everything (except inferior olivary complex) to the deep nuclear cells and granule layer

Question 10

Which of the following are excitatory/inhibitory?

Granule Cells
Basket cells
Stellate Cells
Purkinje Cells
Golgi Type II Cells

Answer 10

Granule cells are excitatory, all other are inhibitory

Question 11

What is the function of the flocculonodular lobe?

Answer 11

mediates rapid changes in body position

Question 12

What is the function of the intermediate zone?

Answer 12

movement control/fine tuning and ballistic/short/fast actions (no time for feedback)

Question 13

What does damaging the intermediate zone lead to?

Answer 13

intention tremors, decreased force, slow movements, and inability to stop a movement once initiated

Question 14

What does the lateral zone control?

Answer 14

motor planning and timing (in conjunction with pre motor area)

Question 15

What does damage to the lateral zone cause?

Answer 15

discoordination of speech and limbs