General
- Aka Roof nuclei (Close to the roof of 4th ventricle).
- Intracerebellar nuclei act to modify muscular activity through the motor control areas of the brainstem and cerebral cortex.
Nuclei types
- Dentate nucleus
- Lies in the centre of each cerebellar hemisphere.
- Cross-section through the nucleus shows a thin lamina of grey matter that is folded upon itself,
- Resembles a crumpled purse with the hilum directed medially.
- Emboliform and Globose nuclei lie medial to dentate nucleus.
- These two nuclei are together called as nucleus Interposed in lower animals.
- Interposed nuclei because they are interposed between the Fastigial and the dentate
- Fastigial nucleus
- Close to the midline
- In the anterior part of the superior vermis.
Nucleus | Afferent | Efferent | Functions |
Fastigial nucleus | • Vestibular apparatus through the vestibular nerve • Vestibulocerebellum, i.e. vermis and flocculonodular lobe | • To vestibular nuclei • To reticular formation of the medulla • To thalamus • To midbrain (red nucleus, central grey matter— nucleus of Darkschewitsch) • To visceral centres in brainstem • To medial accessory and main inferior olivary nuclei | Control of muscle action (axial and proximal limb muscles) in response to labyrinthine stimuli |
Emboliform and globose nuclei (nucleus interpositus) | From the paravermal area or spinocerebellum | • To red nucleus • To thalamus • To reticular formation • To pontine nuclei • To dorsal accessory olivary nucleus | Controls crude movements of the limbs |
Dentate nucleus | From neocerebellum or the lateral part of cerebellar hemisphere | • To thalamus • To red nucleus • To oculomotor nucleus • To inferior olivary nucleus • To reticular formation | Controls highly skilled voluntary movements of precision |
Localisation of function
- Projections pass to the cerebellar nuclei are arranged in a mediolateral sequence corresponding to the position of the nuclei.
- Fastigial nucleus receives fibres from the vermis,
- Globose and emboliform nuclei from paravermal regions,
- Dentate nucleus from the lateral region
- Visual and auditory input to
- Primary visual area
- Folium and tuber.
- Secondary visual area
- Biventral lobule and tonsil.
- Vestibular impulses input to
- Uvula
- Nodule
- Flocculus (vestibulocerebellum)
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