Cerebellar Nuclei Explained: Dentate, Interposed, and Fastigial Connections

Cerebellar Nuclei Explained: Dentate, Interposed, And Fastigial Connections

Question 1. Describe the intracerebellar nuclei and their respective connections.
Answer: There are four intracerebellar nuclei on either side of the midline. From lateral to medial side, these are as follows:

Cerebellar nuclei connections

• Dentate nucleus
• Nucleus emboliformis
• Nucleus fasting
• Nucleus globosus

Dentate nucleus: It is the largest and has the shape of a crumpled bag (crenated crescent) with its hilum facing anteromedially. It receives afferents from the neocerebellum and sends efferents through the superior cerebellar peduncle to the red nucleus of the opposite side, which in turn projects to the spinal cord.

Cerebellar nuclei

Nucleus emboliformis and nucleus globosus: The nucleus emboliformis is oval, whereas the nucleus globosus is round. They receive afferents from the paleocerebellum and send efferents through the superior cerebellar peduncle to the red nucleus of the opposite side. These two nuclei together represent the ‘nucleus interpositus’ of lower mammals, for example monkeys.

Nucleus fastigius: It lies near the midline in the region of the vermis. It receives afferents from the archicerebellum and sends efferents through the inferior cerebellar peduncle to the vestibular nuclei and the reticular formation of the medulla oblongata.

Dentate nucleus