Lecture 14: Cerebellum, Corticospinal tract and motor system Flashcards
Input into the inferior cerebellar peduncle?
Olivio-cerebellar fibres (from inf. olive)
DSCT (from spinal cord)
vestibulo-cerebellar fibres (from vestibular nucleus)
Middle cerebellar peduncle inputs?
From the pons via the ponto-cerebellar fibres
Superior cerebellar peduncle output an input?
Efferents to the Thalamus/Motor cortx
afferents from VSCT
Label?
Order of cerebellum development? Last to first
Neocerebellum
Palaeocerebellum
Archicerebellum
Role of the neocerebellum?
afferents? lesions?
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
Role of Palaeocerebellum?
afferents and lesions?
Ant lobe. For Proprioception (dorsal nucleus of clark)
Afferents: Spino cerebellar fibres and olivocerebellar fibres
lesion: postural instability
Archicerebellum function
afferents? lesions?
Flocculonodular lobe. Involved with BALANCE
afferents: Vestibulocerebellar fibres and olivocerebellar fibres
Lesions: Problems with general balance and issues with eye movements
Efferents of the neocerebellum?
denate nucleus > red nucleus > rubro-spinal > LMN
DN > Thalamus > UMN Planning area > LMN pool
Efferents of the Intermediate part of the pallaeocerebellum?
The Interpositus nucleus > Red Nucleus > Rubrospinal > LMN pool
Efferents of the vermis and flocculonodular lobe?
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
Vestibulo-spinal system?
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
Reticulo-spinal system?
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’
Rubro-spinal system?
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
