12 Vestibular System and Cerebellum - Β Flashcards Preview

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Flashcards in 12 Vestibular System and Cerebellum - Β Deck (78)
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1

The deep indentations of the cerebellum are ___________ while the smaller creases are called ________

Fissures; folia

2

Fissures divide the cerebellum into

Lobes and lobules

3

*The two hemispheres of the cerebellum are joined midline by the

Vermis

4

What are the main lobes of the cerebellum

Posterior, anterior, flocculonodular

5

What defines the flocculus and vermis (the nodule) to form the flocculonodular lobe

Posterolateral fissure

6

*The inferior cerebellar peduncle does what

Afferents to the cerebellum from the spinal cord and brainstem

7

*What is composed of recipricol fibers b/n the cerebellum and vestibular structures

Juxtarestiform body (wall of 4th ventricle)

8

*What part of the cerebellum has fibers arising in SC or medulla

Restiform body

9

*What is the largest cerebellar peduncle? What does it do?

Middle; emerges laterally from the basal pons and is composed of afferents to the cerebellum from the contralateral pontine nuclei

10

*What is unique about the superior cerebellar peduncle

It is most efferent fibers from the cerebellar nuclei and is distributed to the diencephalon and brainstem

11

What are the primary afferents of the cerebellum

Deep cerebellar nuclei

12

What are the main deep cerebellar nuclei

-Dentate

-Interposed comprised of emboliform (anterior interposed) and globose (posterior interposed)

-Fastigial

13

*Each folium of the the cerebellum has a superficial layer ___________ and a core of myelinated fibers ___________

Cerebellar cortex; arbor vitae

14

What are the layers of the cerebellar cortex

-purkinje -granule cell -molecular

15

The granule cell layer is composed of

Cell-dense inner region immediately adjacent to white mayyer core

16

*What are the purkinje cells

Only efferent neurons of the cerbellum

17

What are the granule cells

Excitatory neurons that synapse w/ purkinje cells and the molecular layer (basket and stellate cells) They extend parallel fibers

18

What are the golgi cells

Inhibitory cells within the granular layer, extend dendrites into molecular

19

*What are the basket and stellate cells

Inhibitory cells in the molecular layer

20

What are mossy fibers

Cerebellar afferent axons that originate from cerebellar nuclei and other nuclei in the SC, medulla, pons

21

The mossy fibers branch in granular layer to form

Mossy fiber rosette

22

What gives the mossy fibers their appearance

Cerebellar glomerulus

23

What are excitatory to granule cell and golgi cell dendrite

Mossy fibers

24

What are the afferent fibers to the cerebellar cortex

Climbing fibers and multilayered fibers

25

Climbing fibers arise from

Inferior olivary nuclei

26

What do olivocerebellar fibers do

Send collaterals to the appropriate cerebellar nucleus that corresponds to the overlying cortical zone

27

What is the function of the climbing fibers

Exciting purkinje cells

28

Where are multilayered cells from

Locus ceruleus (noradrenergic) Raphe nuclei (serotinergic) Hypothalamus

29

The main function of the multilayered fibers are

Decreasing spontaneous discharge rates of purkinje cells

30

Which cerebellar fibers innervate all major cell types

Multilayered cells