cerebellum Flashcards
what is the major pathway of fibres to and from the cerebellum
Via the 3 cerebellar peduncles
reticulospinal tract
involves in consciousness, opposes gravity and keeps our body ready to go (wakefulness)
-input onto LMN
rubrospinal tract
allows us to engage in automated movements e.g. swing arms when we walk
- input into LMN
vestibulospinal tract
begins in vestibular nucleus within the medulla and acts on LMNs
involved in balance
what are the 3 lobes of the cerebellum
anterior lobe
posterior lobe
flocculonodular lobe
neocerebellum
- posterior lobe
- fine motor control
- recieves input from the thalamus
- pontocerebellar fibers
- travels to the cerebellum via the middle cerebellar peduncles
paleocerebellum
- anterior lobe
- spinocerebellar fibers
- proprioception
- dorsal nucleus of clark
archicerebellum
- flocculonodular lobe
- vestibulocerebellar fibers
- balance
- travels into the cerebellum via the inferior cerebellar peduncle
superior cerebellar peduncles
involved in most of the output from the cerebellum
deep cerebellar nuclei
- fastigial
- interpositus
- dentate
fastigial
sending output from the area of the vermis and flocculonodular lobe
to the
- lateral vestibular nucleus (vestibulospinal tract)
- reticulospinal (posture)
general alertness and antigravity muscles also involved in balance
interpositus
feeds into the red nucleus which travels down the rubro-spinal tract to LMNs (less important in humans)
automated movement and posture
dentate
out of the neocerebellum fibres travel to the dentate nucleus which sends fibers to the red nucleus which goes to the thalamus and tells UMNs in motor planning area
fine movement control
injury to vestibulocerebellar
- loss of balance and eye movement e.g. nystagmus
lesion in paleocerebellum
postural instability e.g. drunken sailor stance
when intoxication occurs
