258 PRACTICAL HISTOLOGY [XXXII 



nucleus ; between the restiform body and the bulbar 5th root 

 there may be some fibres of the vestibular nerve. 



Fibres of the trapezium ; these are better seen in 8. 



8. Section through the pons and the lower part of the 

 6th nucleus. The pons fibres and their nuclei surround the 

 pyramids and occupy a half or more of the dorso-ventral dia- 

 meter. The fibres of the restiform body are more or less oblique, 

 curving dorsally into the cerebellum. Note : 



In the dorsal part of the inner division of the restiform body, 

 some large angular cells Deiter's nucleus. 



A little below the floor of the 4th ventricle a little distance 

 from the raphe, a round mass of angular cells the nucleus of 

 the 6th nerve. 



Medially of the lower part of the descending 5th, a mass of 

 grey substance with angular cells the nucleus of the 7th 

 nerve ; in it are some large nerve fibres, and others run from 

 its dorsal border dorsally and medially ; similar fibres are seen 

 curving dorsally of the nucleus of the 6th nerve ; medially of the 

 6th nucleus is a small bundle of fibres the ascending fibres of 

 the 7th. (The 7th nucleus is more conspicuous in a section a 

 little below the 6th n. nucleus, it begins at the upper end of the 

 lower olive.) 



Ventrally of the nucleus of the 7th nerve a round mass, not 

 showing nerve cells very distinctly the upper olive. 



Immediately dorsally of the pons fibres and its nucleus a 

 somewhat elongated mass of transversely cut fibres the fillet, 

 now fairly distinct from the surrounding tissue. 



The change of form from the inter-olivary tract may be seen 

 with the eye if two or three sections are made between 7 and 8. 

 It first becomes somewhat comma-shaped on either side of the raphe 

 and then extends laterally. 



In the white matter of the cerebellum near the lateral angle 

 of the 4th ventricle, a folded lamina of grey substance the 

 nucleus dentatus (this is present in 6 and 7 but more 

 dorsally). 



