30 PISCES. 



5. Fifth nerve ; it appears to have two origins ; one from the restiform body, the 



other from a pedicle or process of the oblong medulla at the side of the 

 cerebellum. There is an intermixture of different portions as in a ganglion. 



6. Par vagum ; it arises in a lengthened row of fibrils from the restiform body. 



This is the last of the cerebral nerves. 



FIG. II. 



THE BASE OF THE BKAIN, AND THE VENTRAL ASPECT 



OF THE SPINAL COED. 



a. ANTERIOR lobes of the brain; b. Mammillary eminences ; c. Nose. 



* 



1. Olfactory nerve. 



2. Optic nerve ; it proceeds from the optic lobe and mammillary eminence, and 



the pedicle of the anterior lobe ; there is an interlacing of the nervous fibres 

 just before the nerves separate. 



3. Third nerve ; it arises from the base in the track of the pyramidal body, a 



little behind the mammillary eminence. 



4. Fourth nerve. 



5. Fifth nerve ; it arises from the restiform body and from the pedicle or process 



of the oblong medulla at the side of the cerebellum. 



6. Auditory nerve ; it is a portion of the fifth ; it gives branches to the enlarge- 



ments of the semicircular canals and the sac of the labyrinth, and com- 

 municates on this with the glosso-pharyngeal nerve. 



7. Sixth, or abducent nerve ; it arises from the base of the brain in the track 



of the anterior pyramidal body, and terminates in the abductor muscle of 

 the eye. 



8. Glosso-pharyngeal nerve ; it arises just behind the upper portion of the par 



vagum : indeed, it would seem to be a part of the same, and only ascending 



