958 



NUCLEI OF CRANIAL NERVES. [BOOK m. 



cerned in hearing; and in some structural details these two 

 divisions of the auditory nerve differ from each other. Hence 

 it is important to note that according to careful investigations the 

 cochlear nerve is the continuation of the dorsal root and the 

 vestibular nerve the continuation of the ventral root. 



br.P gr.P 



FIG. 111. THROUGH THE WIDEST PART OF THE FOURTH VENTRICLE. (Sherrington.) 



Taken in the line 111. Fig. 108. 



Py. Pyramidal fibres cut transversely, tr. P. the superficial (ventral) transverse 

 fibres of the pons. The shaded part of the pons (gr. P.) indicates grey matter 

 mingled with the deeper transverse fibres. F. the fillet. Tp. the trapezium. 

 C. R. the restiforrn body or inferior peduncle of the cerebellum, cut across 

 obliquely. S. P. the superior peduncles of the cerebellum, r. raphe. 

 s. o. superior olive. C. D. corpus dentatum of the cerebellum. Rf. n. the 

 nucleus of the roof. s. g. tubercle of Eolando. V. S. section through sulcus in 

 the vermis superior of the cerebellum. t. bundle from the olive to the 

 lenticular nucleus. 



VIII. the eighth or auditory nerve, its ventral or vestibular root, proceeding from 

 VIII. (3. the front part of the lateral auditory nucleus. VII. n. the nucleus 

 of the seventh or facial nerve. VI. the nucleus of the sixth nerve. VII. g. 

 fibres of the seventh nerve cut across as they sweep round the nucleus of the 

 sixth before issuing from the pons as VII. 



4th. the fourth ventricle, here roofed in by the cerebellum; the shading of the 



central grey matter immediately surrounding the ventricle is, for the sake of 



simplicity, omitted. 



