Cerebellum

Question 1

Cerebellum is derived from ectodermal thickenings about the cephalic borders of the fourth ventricle known

Answer 1

rhombic lip

Question 2

Five deep fissures divide the cerebellum into lobes and lobules

Answer 2

1. primary - deepest
2. posterior superior
3. horizontal
4. prepyramidal
5. posterolateral

Question 3

part of the cerebelllum represented by nodulus, paired floculi, OLDEST
most closely related to the vestibular system

Answer 3

Archicerebellum

Question 4

Anterior lobe of the cerebellum
Rostral to the primary fissure
Receives impulses from stretch receptors via the spinocerebellar tracts and is part most concerned with the regulation of muscle tone

Answer 4

Paleocerebellum

Question 5

Largest and phylogenetically newest part of the cerebellum
Lies between the primary and posterolateral fissures
Constitute the posterior lobe
Most concerned with coordination of somatic motor function

Answer 5

Neocerebellum

Question 6

3 layers of cerebellar cortex

Answer 6

Molecular
Purkinje
Granular

Question 7

2 types of neurons in the molecular layer

Answer 7

basket cell

outer stellate cell

Question 8

True or False

Dendrites of basket and outer stellate cells are confined to the molecular layer as are the axons of the outer stellate cells

Answer 8

True

Question 9

True or False

Molecular layer contains the dendrites of purkinje and Golgi type II cells and the transversely oriented axons of granule cells

Answer 9

True

Question 10

tertiary branches of purkinje cells

Answer 10

spiny branchlets or gemmules

Question 11

True or False

Purkinje cell axons are myelinated

Answer 11

True

Question 12

discharge pathway of cerebellar cortex

Answer 12

Purkinje cells

Question 13

Main neurotransmitter in purkinje cells

Answer 13

GABA

Question 14

True or

Axons of granule cells are unmyelinated that ascend vertically into the molecular layer and bifurcate into branches which run parallel to the long axis of folium

Answer 14

True

Question 15

where does axons of Golgi II cells terminate

Answer 15

cerebellar glomeruli

Golgi cells are GABAergic

Question 16

Inhibitory interneurons in the Cerebellar cortex

Answer 16

outer stellate cells
basket cells
Golgi II cells

Question 17

entire output of cerebellar cortex conveyed by ________ cells, which is _______ (excitatory or inhibitory) on cells with which they synapse, namely, _____

Answer 17

Purkinje cells
inhibitory (GABA)
deep cerebellar nuclei and portions of vestibular nucleo

Question 18

deep cerebellar nuclei

Answer 18

lateral to medial

dentate
emboliform
globose
fastigial

Question 19

Cerebellar projections

efferent fibers of cerebellar cortex ->
cells of vermis ->
cells of intermediate zone->
cells in lateral zone->

Answer 19

purkinje cells project onto deep cerebella rnuclei

Cells of vermis project mainly to the fastigial nucleus
Intermediate zone to globose and emboliform (interpositus)
Lateral zone to dentate

Question 20

palatal myoclonus results from a lesion in this interesting loop, locaton

Answer 20

cerebellar-reticular-cerebellar feedback in the Guillain Mollaret triangle

Question 21

predominant afferent input to the cerebellum

Answer 21

via Mossy fibers

which are axons of the spinocerebellar tracts and the proections from pontine, vetsibular and reticular nuclei

Question 22

only excitatory cell in cerebellum

neurotransmitter

Answer 22

granule cells

glutamate