Cerebellum part 2 Flashcards Preview

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Flashcards in Cerebellum part 2 Deck (54):
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medial longitudinal fasiculus (MLF)

vestibular nucleus sends axons thru MLF to CN III, IV, VI

nuclei

 

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axons sent  thru MLF to CN III, IV, VI

nuclei

bilateral in

Vestibulocerebellar System

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mooth pursuit

allows the eyes to follow a moving stimulus (maintains the stimulus on the fovea)

 

needs the cerebllum

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smooth pursuit

Cortical eye fields -->vest nuclei--> Cb --> vestibular nucleus --> CN III, IV, VI nuclei via the MLF

Cortical eye fields --> pontine nuclei --> Cb --> vestibular nucleus --> CN III, IV, VI nuclei via the MLF

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The cerebellum compares the----- ------with the intended movement and -------- the required corrections to maintain ------ and proper eye position .

The cerebellum compares the vestibular input with the intended movement and “computes” the required corrections to maintain equilibrium and proper eye position .

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Generalized loss of equilibrium

Lesion of the Vestibulocerebellum

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Impaired ability to coordinating eye movements with head movements

Lesion of the Vestibulocerebellum

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Altered output along medial vestibulospinal tract – Altered output along MLF

Lesion of the Vestibulocerebellum

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Carries proprioceptive information trunk & LEs (T1 and below)

tPosterior Spinocerebellar Tract

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tCuneocerebellar Tract

Carries proprioceptive information neck & UEs (rostral to T1)

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Anterior Spinocerebellar Tract

proprioceptive information and cutaneous information

from receptors with large receptive fields from LEs

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Carries proprioceptive information from the oral cavity

Trigeminocerebellar Tract

14

Propriceptive afferents travel in dorsal column

of Posterior Spinocerebellar Tract and travel to 

Clarke’ s Column T1 - L2

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Axons travel superiorly within the

posterior spinocerebellar tract

A image thumb
17

 

Posterior spinocerebellar tract travels thru

Inferior cerebellar peduncle

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tf Posterior Spinocerebellar Tract only travel to vermis

F vermis and paravermis

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TF Cuneocerebellar Tract

Axons travel in the dorsal column (fasciculus cuneatus) to med/ internal/ accessory cuneate nucleus

Cuneocerebellar Tract

Axons travel in the dorsal column (fasciculus cuneatus) to Lateral/ external/ accessory cuneate nucleus

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TF Cuneocerebellar Tract uses Clarke’s Column T1 - L2

F

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propriceptive afferents from C1-C8

Cuneocerebellar Tract

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Ipsilateral

Cuneocerebellar Tract

Posterior Spinocerebellar Tract

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travels contralat then contralat back to same side

(after ascending)

Anterior Spinocerebellar Tract

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Superior cerebellar peduncle

Anterior Spinocerebellar Tract

fibers 

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both use Inferior cerebellar peduncle

Cuneocerebellar Tract

Posterior Spinocerebellar Tract

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Primary afferents synapse on spinal border cells (T2-L5)

Anterior Spinocerebellar Tract

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Trigeminocerebellar Tract

Proprioceptive info carried along branches of CN-V (ie. muscles of mastication, periodontal ligament)

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Proprioceptive info carried along branches of CN-V (ie. muscles of mastication, periodontal ligament) carried to

trigerm. cerebellar tract 

spinal trigeminal nucleus.

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Axons from the spinal trigeminal nucleus project to the cerebellum

trigem cereblar tract

via the inferior cerebellar peduncle.

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trigeminoceebellar tract

cerebellum influences motor output by projecting to the

trigeminal motor nucleus.

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This circuit allow the oral motor system to receive ------ --------- during mastication

 

trgemcerebellar tract

This circuit allow the oral motor system to receive continual feedback during mastication

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The cerebellum monitors the ------ ------- on muscles of mastication and influences ------ output accordingly.

 

trigem. cerebllar tract

The cerebellum monitors the changing demands on muscles of mastication and influences motor output accordingly.

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(ant post)Spinocerebellar and Trigeminocerebellar Tract

functions

After processing proprioceptive information in cerebellum , cerebellar efferents project to motor regions, either directly or indirectly via the thalamus.

 

allows for adjustment of movement during ongoing movement

34

Functions Spinocerebellar and Trigeminocerebellar Tracts

The cerebellum compares the intended movement with the actual movement and “computes” the required corrections.

 

Efferent projections from the cerebellum corrects the movement

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Corticospinal tract and Rubrospinal tract

act modulate motor output in the Spinocerebellar System in the Proprioceptive afferents responce

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synapse in red nucleus

Rubrospinal tract efferent responce

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contralateral to the skeletal muscle

Corticospinal tract and  Rubrospinal tract

 

(Spinocerebellar System afferent responce)

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Impaired ability to control axial muscles/ impaired trunk control

Lesion of the Spinocerebellum

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Altered rate, range, accuracy of limb movements

Lesion of the Spinocerebellum

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Dysmetria (overshooting a target)

lead to Intention Tremor

in Lesion of the Spinocerebellum

and inLesion to the Cerebrocerebellum

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Dysmetria

Rely on the feed-back

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inf olive role in cerebrocellebellar tract

recieves input from dentate(from cerebellar hemisphere)

then has to correct and send climbing fibers to lat hemisphere of cerebellum

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Receives extensive input from the cerebral cortex (via pontine nuclei)

cerebellum in the 

Cerebrocerebellar System

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Involved in the planning, initiation, timing and control of motor movements.

cerebellum

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VA/VL

recieves neurons from dentate

and sends neurons to motor cortex to modulate activity

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Pontine nuclei

recieves infor fromcerebral cortex  and sends info to lateral hemishphere of Cerebelum

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climbing fibers

goes thru Inferior cerebellar peduncle to cerebellum(lat hemisphere)

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Middle cerebellar peduncle

carries axons from pontne nucleus to lat cerebellum

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contralat 

Corticospinal and Rubrospinal Tracts

 

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The cerebellar hemisphere compares the ---- movement with the ----- movement and “computes” the required corrections for the next time the task is performed.

The cerebellar hemisphere compares the intended movement with the actual movement and “computes” the required corrections for the next time the task is performed.

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------ projections from the cerebellum corrects the movement via the ----- tract.

Efferent projections from the cerebellum corrects the movement via the corticospinal tract.

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Studies on non-human primates

reversible cooling in the ----- nucleus resulted in delayed ----- of movement.

reversible cooling in the dentate nucleus resulted in delayed onset/initiation of movement.

Lesion to the Cerebrocerebellum

54

Movement takes place ----- rather than being coordinated smoothly

Lesion to the Cerebrocerebellum

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Impaired ability to plan motor movement

seen with inactivating the interposed [globos/emboliform] in monkeys

Lesion to the Cerebrocerebellum