Lecture 14: Cerebellum, Corticospinal tract and motor system Flashcards

1
Q

Input into the inferior cerebellar peduncle?

A

Olivio-cerebellar fibres (from inf. olive)

DSCT (from spinal cord)

vestibulo-cerebellar fibres (from vestibular nucleus)

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2
Q

Middle cerebellar peduncle inputs?

A

From the pons via the ponto-cerebellar fibres

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3
Q

Superior cerebellar peduncle output an input?

A

Efferents to the Thalamus/Motor cortx

afferents from VSCT

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4
Q

Label?

A
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5
Q

Order of cerebellum development? Last to first

A

Neocerebellum

Palaeocerebellum

Archicerebellum

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6
Q

Role of the neocerebellum?

afferents? lesions?

A

Fine motor control (fibres from the pons to the cerebellum then to the thalamus)

Afferents: Pontocerebellar fibres, olivocerebellar fibres

Lesion: results in difficulty with fine movements and har to stop movements like touching nose and finger repeatedly. INTENTION TREMOUR and -ve rebound sign

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7
Q

Role of Palaeocerebellum?

afferents and lesions?

A

Ant lobe. For Proprioception (dorsal nucleus of clark)

Afferents: Spino cerebellar fibres and olivocerebellar fibres

lesion: postural instability

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8
Q

Archicerebellum function

afferents? lesions?

A

Flocculonodular lobe. Involved with BALANCE

afferents: Vestibulocerebellar fibres and olivocerebellar fibres

Lesions: Problems with general balance and issues with eye movements

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9
Q

Efferents of the neocerebellum?

A

denate nucleus > red nucleus > rubro-spinal > LMN

DN > Thalamus > UMN Planning area > LMN pool

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10
Q

Efferents of the Intermediate part of the pallaeocerebellum?

A

The Interpositus nucleus > Red Nucleus > Rubrospinal > LMN pool

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11
Q

Efferents of the vermis and flocculonodular lobe?

A

vermis (palaeocerebellum) > Fastigial nucleus > reticular formation and lat. vestibular n. > reticulo-spinal and vestibulo-spinal > LMN pool

Flocculonodular lobe > lat. vestibular nucleus > vestbulo-spinal > LMN pool

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12
Q

Vestibulo-spinal system?

A

From the Flocculonodular lobe to the Lateral vestibular nucleus in the medulla to the LMN

= Allows orientation of the body off balance from 8th cranial nerve (vestibulocochlear)

= a feedback loop as the cerebellum recieves input from the vestibalar nucleus

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13
Q

Reticulo-spinal system?

A

Vermis of posterior lobe to the reticular formation (a collection of nuclei) and then down the reticulo-spinal path to LMN

= To do with consciousness to oppose gravity and ‘keeping the body ready to go’

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14
Q

Rubro-spinal system?

A

input to the red nucleus from the interpositus and denate nucleus before heading to LMN pool.

= invlved with automated movements like swinging arms when walking. More important in less complex animals

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