Cerebellum Flashcards
what does the cerebellum develop from embryologically
metencephalon of the hindbrain
which region of the brain stem is the cerebellum at teh same level as
the pons, separated from it by the 4th ventricle
is the cerebellum ipsilateral or contralateral
ipsilateral brain
describe the inner structure of the cerebellum
- outer cortex of grey matter
- inner white matter
- 3 masses of gray matter forming the intracerebellar nuclei in the centre
cerebellum structure
how is the cerebellum attached to the brainstem
via 3 stalks called peduncles - superior, middle and inferior
inner structure of outer cortex of cerebellum
3 layers: molecular, Purkinje and granular layer
how do afferent projections arrive in the cerebellum
- enter via the peduncles
- are projected mainly to the granular cell layer
- interact with Purkinje layer
which layer of the cerebellar cortex is responsible for the efferent projections
entire output of the cerebellar cortex is through the axons of Purkinje fibres
efferent projections from cerebellum
- Purkinje fibres
- mainly synapse on neurons of deep cerebellar nuclei
- cross the midline and synapse in the thalamus
- thalamus sends fibres to motor cortex
cerebrocerebellum
- largest division formed by the lateral hemispheres
- Planning movements and motor learning. Also regulates coordination of muscle activation and is important in visually guided movements
spinocerebellum
- composed of vermis and intermediate zones of cerebellar hemispheres
- Involved in regulating body movements by allowing for error correction and also carries proprioceptive information
vestibulocerebellum
- flocculonodular lobe and vermis
- controls balance and ocular reflexes, mainly fixation on a target
- Receives inputs from the vestibular system and sends outputs back to the vestibular nuclei
