432 JOHN H. STOKES 



Finally we pass to a short consideration of the sagittal sec- 

 tions shown, which serve the purpose of presenting in panoramic 

 style many of the features of the foregoing discussion. 



Fig. 13. Series C, slide 80, section 2. This section is taken ap- 

 proximately midway between the raphe and the side of the brain 

 stem. It is too far medial to show much of the cochlear nuclei, 

 but presents in especially satisfactory manner the antero-posterior 

 relations of the seventh nerve nucleus, the nucleus of the superior 

 olive and the origin of the lateral lemniscus and its nucleus. The 

 nucleus colliculi inferioris is also especially well shown, together 

 with its decussation in cross section, which has not appeared in the 

 preceding figures. The antero-posterior dimension of the vestib- 

 ular system in the medulla is also given, including the piercing 

 of the medial nucleus .by the strands of the olivo-cochlear tract. 

 The decussation of fibers from the superior nucleus of the vestibu- 

 lar in association with those from the fifth is seen in cross section 

 anterior to the radix N. facialis. Some idea is also given of the 

 sagittal section of the cerebellar base. 



Fig. 11,.. Series C, slide 93, section 1. This section is taken 

 lateral to the preceding one and is intended primarily to present 

 the mesencephalic portion of the cochlear apparatus. The 

 arrangement of the fibers of the lateral lemniscus, the nucleus 

 lemnisci lateralis, the brachium colliculi inferioris and the medial 

 geniculate body are ideally presented. Posteriorly the tuberculum 

 acousticum is prominent and a good cross section of the corpus 

 trapezoideum forms the ventral boundary of this part of the 

 medulla. The close association of the anterior part of the vestib- 

 ular complex and the sensory nucleus of the fifth is again apparent. 

 The ascent of the nucleo-cerebellar tract to its distribution and 

 descussation in the base of the cerebellum is not as well shown as 

 in some of the preceding figures. 



