[HISTO] CEREBELLUM

Question 1

gray matter includes

Answer 1

outer cortex
4 pairs of cerebellar nuclei

Question 2

white matter includes

Answer 2

afferents
efferents

Question 3

each folium contains

Answer 3

white matter core
grey matter covering

Question 4

layers of cerebellar cortex

Answer 4

molecular layer
purkinje layer
granular layer

Question 5

outermost layer

Answer 5

molecular layer

Question 6

middle layer

Answer 6

purkinje layer

Question 7

innermost layer

Answer 7

granular layer

Question 8

outer stellate cells

Answer 8

~found in: superficial part of molecular layer
~small cell bodies
~short dendrites in same layer
~axons parallel to cerebellum surface
~synapse w/ purkinje dendrites

Question 9

basket cells

Answer 9

~found deep in molecular layer
~dendrites in same layer
~axons=basket arborizations around purkinje cell bodies
~synapse w/ 10 Purkinje cells

Question 10

fibers found in molecular layer (6)

Answer 10

1-dendritic arborizations + axons
2-Climbing fibers
3-Purkinje dendrites
4-Purkinje axons
5-axons of granule cells
6-dendrites of Golgi type II cells

Question 11

Purkinje cells

Answer 11

~large pyriform flask cell body
~vesicular central nucleus
~coarse cytoplasmic Nissl’s granules
~dendritic tree give 1ry,2ry & 3ry branches
~axons=myelinated
~synapse w/ deep cerebellar nuclei
~efferent pathway

Question 12

which cell’s axons synapse w/ deep cerebellar nuclei

Answer 12

purkinje

Question 13

cells w/ myelinated axons

Answer 13

Purkinje

Question 14

cells w/ unmyelinated axons

Answer 14

granular
olivocerebellar fibers

Question 15

granule cells

Answer 15

~small
~large rounded nucleus
~thin cytoplasm
~few Nissl’s granules
~unmyelinated axon
~dendrites= claw like=terminate in glomerulus
~axons bifurcate to give parallel fibers
~synapse w/ purkinje dendrites

Question 16

cells which synapse w/ dendrites of Purkinje fibers

Answer 16

outer stellate cells
basket cells
granule cells

Question 17

parallel fibers originate from?

Answer 17

granule cells’ axons

Question 18

golgi type II cells

Answer 18

dendrites extend in all layers of cortex
axons end in glomerulus

Question 19

cerebellar islands/glomeruli

Answer 19

irregularly dispersed pale non cellular areas

Question 20

synaptic structure of cerebellar islands

Answer 20

1-mossy fibers terminals
2- dendrites of granule cells
3-axons of golgi II

Question 21

function of cerebellar islands

Answer 21

excite granule cells which (+) purkinje fibers

Question 22

the only excitatory neuron of the cerebellar cortex

Answer 22

granule cells

Question 23

only efferent pathway of the cerebellar cortex

Answer 23

Purkinje cell axons

Question 24

purkinje cell axons effect on cerebellar nuclei

Answer 24

inhibitory

Question 25

Purkinje cells receive which fibers?

Answer 25

climbing fibers mossy fibers

Question 26

structure responsible for sending efferents from the cerebellar cortex

Answer 26

deep cerebellar nuclei

Question 27

all Purkinje fibers discharge to cerebellar nuclei EXCEPT IN?

Answer 27

flocculonodular lobe they discharge directly to vestibular nuclei

Question 28

afferent fibers

Answer 28

Climbing fibers mossy fibers

Question 29

afferent fibers enter cerebellar cortex via

Answer 29

ICP MCP

Question 30

climbing fibers

Answer 30

olivocerebellar fibers nonmyelinated climb smooth dendritic branches of purkinje cells

Question 31

stimulation of climbing fibers leads to

Answer 31

Purkinje cells stimulation

Question 32

mossy fibers (6)

Answer 32

(all except olivocerebellar) 1-ventral external arcuate 2-Vestibulo-cerebellar tract 3-reticulo-cerebellar tract 4-Ponto-cerebellar tract 5- spinocerebellar tracts 6-Cuneocerebellar tracts

Question 33

role of mossy fibers

Answer 33

enter granular layer & give collaterals + rosettes

Question 34

rosettes

Answer 34

fine lobulated enlargements. form center of glomeruli

Question 35

Purkinje cells project efferent fibers to

Answer 35

deep cerebellar nuclei vestibular nuclei

Question 36

deep cerebellar nuclei (4)

Answer 36

dentate emboliform globose fastigial

Question 37

wedge shaped cell mass medial to dentate nucleus

Answer 37

emboliform

Question 38

rounded cell group medial to emboliform nucleus

Answer 38

globose

Question 39

largest nucleus convoluted mass of gray matter w/ hilus directed medially

Answer 39

dentate

Question 40

most medial nucleus

Answer 40

fastigial

Question 41

corticonuclear projections are projected:

Answer 41

from purkinje cells to deep cerebellar nuclei

Question 42

most corticonuclear projections are projected to

Answer 42

fastigial nucleus

Question 43

fastigial nucleus projects corticonuclear projections to?

Answer 43

1-vestibular nuclei= vestibulospinal tract 2-RF= reticulospinal tract

Question 44

dentate, emboliform & globose nuclei project corticonuclear projections to:

Answer 44

1-red nucleus= rubrospinal tract 2-VLN of thalamus= thalamo-cortical tract

Question 45

overall function of deep cerebellar nuclei

Answer 45

regulation of muscle tone & movement coordination

Question 46

extracerebellar inputs come from

Answer 46

pontine nuclei & inf. olivary nucleus TO--->dentate

Question 47

which nucleus receives extracerebellar inputs?

Answer 47

dentate