TABLE 13-1 THE NUMBER OF SEGMENTS IN THE HEAD AS iNDtCATED BY ARCHES, NERVES, AND MYOTOMES* 



Gegenbaur (1 871 ) 

 Arch Nerve 



Marshall (1881) 

 Somite Eye Muscles Nerve 



Somite 



van Wiihe (1882) 



Nerve Eye Muscles 



POSITION OF OTIC CAPSULE 



■ Dorsal nerve roots lie to the left of the hyphen, ventral roots to the right. 



nial wall 



olfactory bulb 



telencephalon. 



optic nerve {II) 



habenula 

 diencepholon, 

 mesencephalon 



motor division of V, 



VII 



otic VII 



medulla 



^ay 



inferior lobe 

 pituitary 



B 



Figure 13-17. Brain and cranial nerve roots of Eptatretus. A, dorsal view; B, ventral view. (After 

 Worthington, 1905) 



400 • THE NERVOUS SYSTEM 



