256 PRACTICAL HISTOLOGY [XXXII 



chiefly to and through the olive. Note the bundles running between 

 the bulbar root of the 5th and its nucleus, apparently from all parts of 

 the olive, to the restiform body. Note also the fibres curving round 

 the outer border of the olive, and the numerous bundles running 

 across the raphe between the olives. 



6. Section a little below the pons and through the lower 

 region of the cochlear division of the 8th nerve. 



In this region of the medulla the appearance of the dorsal 

 part of adjoining sections varies very considerably. 



In the more caudal region, the 12th nucleus and fibres from 

 it will be seen. 



A little more anteriorly, there are no 12th n. fibres ; the 

 grey matter in the position of the 12th nucleus has moderate 

 sized cells ; in it near the middle line is a round mass of deeper 

 stained grey matter, the nucleus of the funiculus teres. Ventro- 

 laterally of this is a small elongated mass of cells, the dorsal 

 nucleus of the 9th n. ; probably a thin bundle of fibres run 

 from it to the surface through the middle of the bulbar 5th n. 

 The solitary bundle is fairly large and fibres may run from it to 

 the surface through the dorsal part of the bulbar 5th n. The 

 nucleus ambiguus and lateral nucleus will probably be seen. 



A little more anteriorly still, the only part of the 9th system 

 present is a small solitary bundle with a little grey substance 

 medially of it, and 9th n. fibres running from it through the 

 dorsal limit of the bulbar 5th. The dorsal nucleus of 8 v. 

 stretches to the raphe. 



The nucleus funiculus gracilis and nucleus funiculus cuneatus 

 are not present or are not recognizable as separate masses. 

 The internal arcuate fibres are much fewer in the dorsal region, 

 though there are many transverse fibres. 



Numerous internal arcuate fibres are still seen running 

 through the descending 5th root connecting the restiform body 

 and the olives. 



Note : 



The mass of grey substance with scattered, but not very 

 obvious, cells forming a large part of the floor of the 4th ven- 

 tricle the median nucleus of the vestibular nerve (8 v.) ; laterally 



