62 

 neons components of the V, IX, anJ X necves. The isubstantii 

 gelitinosa contains ^,roups of small Golgi 11 neurones forrning 

 dense, felt-like tangles; many terninil arborizations are found 

 in these. Other terminations occur near larger neurones lying 

 in the deeper parts of the nucleus. Many fibres of the system 

 do not terminate in the nucleus, but are carried posteriorly 

 as the spinal V tract for ultimate termination in the spinal 

 CO r i . 



The tuberculum acusticum is a phylogenetioally young struct- 

 ure, not deriv/able from the cord directly. It is the primary 

 centre for the acustico-latsral system, components of the VII, 

 VIII, and X ner^^es. There are present, neurones of the molec- 

 ular, granular, and Purkinje types, identical ^ith those of 

 the cerebellum. Terminations occur in the molecular layer, 

 and near the neurones of Purkinje. The Purkinje neurones send 

 their axones ventrally in the arcuate bundles. The cerebellar 

 crest is morphologically continuous -vith the cerebellum. There 

 is ground for believing that further investigation «ill derive 

 the acusticum from dorsal cornu structures. 



Supporting elements are present in the oblongata in great 

 numbers. There is traceable a wide range of developmental 

 forms of both neuroglia an3 epenlyma. 



