Cerebellum Flashcards Preview

anatomy block 4 > Cerebellum > Flashcards

Flashcards in Cerebellum Deck (51):
1

tf Cerebellum give rise to descending motor pathways. 

Cerebellum does not give rise to descending motor pathways. Ø

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tf Damage to the cerebellum or its pathways DOES cause paralysis

Damage to the cerebellum or its pathways DOES NOT cause paralysis

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Input to cerebellum is

sensory

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Output of cerebllum

travels to motor structures

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 rate, range, direction or accuracy of motor movements.

is disturbed by damage to the cerebellum

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cerebellum

modulates motor output

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in addition to motor output cerebllum

modulates complex behavioral and cognitive functions

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receives and processes vestibular information

flocculonodular lobe

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nodulus is

medial  flocculonodular

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flocculus is 

flocculus is lateral part of flocculonodular lobe

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tf flocculonodular lobe is post to post lobe

ant to it

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posterior lateral fissure

sep flocculonodular lobe and posterior lobe

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Lateral Hemisphere

forms the bulk of the cerebellum

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Paravermis:

Paravermis: R and L zones adjacent to the vermis

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highly convoluted, forming the cerebellar folia

cerebellum

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Molecular layer

contains local circuit neurons and abundant axons and dendrites.

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.Purkinje cell layer (middle layer):

formed by a single layer of large neurons called Purkinje cells(PCs)

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Granular layer (deep layer):

composed mainly of small granule cells, but also contains other cell types.

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t The white matter core of the cerebellum is t

he location of the deep white matter cerebellar nuclei (DCN).

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Buried within the white matter of the cerebellum

deep cerebellar nuclei (DCN)

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most medial of deep cerebellar nuclei (DCN)

 receives projections from vermis

Fastigial nucleus •

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lateral to fastigial n. 

receives projections from paravermis

Globose nucleus

 

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Emboliform nucleus 

lateral to globose n

receives projections from paravermis

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Dentate nucleus

• most lateral •

receives projections from lateral hemisphere

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tf body parts are epresented continuously in the cerebllar cortex

body parts are not represented continuouslyin the cerebllar cortex

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fractured somatotopy

body part is represented in several locations on cerebellar cortexx

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trunk is represented in

the midline region (vermis) of cereblar cortex

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Label wat is missing on cerebllar cortex

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Inferior Cerebellar Peduncle

afferents to cerebellum from spinal cord & medulla.

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Middle Cerebellar Peduncle

o Mainly afferents to cerebellum from pontine nuclei

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Superior Cerebellar Peduncle

Mainly efferents from the cerebellum.

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The cerebellum is attached to the brainstem by -- pairs of ----- bundles comprised of --- and ---- axons ----- the cerebellum

The cerebellum is attached to the brainstem by 3 pairs of fiber bundles comprised of afferent and efferent axons to/from the cerebellum

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(1.) cerebellar cortical region (2.) cerebellar nucleus/nuclei

Functional systems associated with the cerebellum

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These regions are involved in processing vestibular information

Vestibulocerebellum

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These regions are involved in processing cerebral cortical inputs

Cerebrocerebellum

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These regions are involved in processing proprioceptive inputs

Spinocerebellum

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lateral hemisphere and dentate nucleus

Cerebrocerebellum

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flocculonodular lobe,

fastigial nucleus

vermis 

Vestibulocerebellum

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vermis, paravermis

globose and emboliform nuclei

Spinocerebellum

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maintaining equilibrium, posture and head position

Vestibulocerebellar System

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uses vestibulospinal tracts

Vestibulocerebellar System

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primary vestibular afferents and axons of 2nd order neurons from the vestibular nucleus.

FN lobe and vermis

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Purkinje cells in the FN lobe mainly project

directly to the vestibular nuclei

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 vermis project to the

fastigial nucleus (most) which serves as a relay to the vestibular nucleus.

Vestibulocerebellar System

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primary vestibular afferents and axons of 2nd order neurons from the vestibular nucleus.

 

go thru Inferior cerebellar peduncle

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Vestibulocerebellar System Assists in coordinating eye movements with head movements via

connections with the motor nuclei of CN-III, -IV and -VI

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coordinating eye movements with head movements

of Vestibulocerebellar System

 

Vestibular apparatus (position of head in space) -->

vestibular nucleus --> cerebellum à vestibular nucleus

--> CN III, IV, VI via medial longitudinal fasiculus (MLF)