58 Anatomy of the Nervous System 



in man and are more or less fused with each other (particu- 

 larly the nuclei globosus and emboliformis, which are often 

 together called nucleus intermedins or interpositus in lower 

 mammals) in most sections. They receive fibres from the 

 Purkinje cells, and the nucleus fastigii, which is related 

 particularly to the vestibular apparatus, also receives nerve 

 endings from other parts of the nervous system. The axons 

 of the nuclei globosus and emboliformis join those of the 

 dentate nucleus in the brachium conjunctivum, while those of 

 the nucleus fastigii pass to the reticular formation of the hind 

 brain as the cerebello -bulbar or fastigio-bulbar tracts. Some of 

 these fibres to the hindbrain form a rather definite bundle, 

 the tr actus arcuatus Russell, or fasciculus cerebello-bulbaris 

 {fasciculus uncinatus) (PI. XL). This leaves the ventral 

 surfaces of the deep nuclei and curves anteriorly and laterally 

 round the dorsal aspect of the brachium conjunctivum, 

 between it and the ventral spino-cerebellar tract. It then 

 runs postero-ventro-laterally, medial to the restiform body, 

 and joins the descending vestibular root, with which it passes 

 backwards. 



