THE CRANIAL NERVES 



643 



is based upon function rather than upon structure, and implies that 

 these components are arranged in accordance with their terminations. 

 Thus, the classification of these nerves should be based upon the 



Out edge of eeretellar peduncle 



Pineal body 

 ColUculus superior , , , 



- ColUculvs inferior \ "f '"^- 1"^^' 

 Pulvinar of thala^mua 

 iteaial geniculate body 



Jjateral geniculate body 



Funiculus gracilis 

 funiculus cu)i 

 tndeenieal *'^ ventricle 



Fig, 318. — View from Dorsal Aspect of Upper Part of the Spinal Cord, Medulla 

 Oblongata, Pons, Fourth Ventricle, Mid-brain, Thalamus, etc.. Dissected in situ. 

 (J. Symington.) 



type of organ with which they are united peripherally or upon the 



type df center in which they arise or terminate. ^ Thus, it happens 



that a certain cranial nerve may embrace fibers from two different 



1 Herrick, Wood's Reference Handbook of the Med. Sciences, iii, 1914, 321. 



