96 



ANATOMY OF THE CENTRAL NEEVOUS SYSTEM. 



pressure in the surrounding medium. It at least appears to be well adapted 

 to such a purpose. In amphibia it disappears when terrestrial life is entered 



Lobus N. trigemini 



Lobua N. vagi 



Tr. vago-cerebellaris et tectalis 



Kiicl. mot. N. vagi 



Kadices N. vagi _,i;^ 



Faso. longit. post, et Tr. tectn-spinalis ■ 



Rad. mot. N. vagi _ 



Vagus desc. et Tr. \:igo-cevebcllaris ' 



Tr. bulbo-spinalis N. trig. 



Tr. assoc. breves et fibr. arcif. ext. 





Lobus N. trigemiai 



Radices lobares") 

 N. trig. J 



Most posterior por- "1 

 tiou of the acustjcus | 

 region, with descend- 

 ing acusticus root6 J 



Tr. acust. teet. 

 ^e^ltr , eoipns tra- 

 pez., et oliv. sup. 





-Decussiitio (acust.?) 





Figs. 52 and 53. — From the SleduUa of the barbel, Barhus fliividtUis ; 

 vagus and trigeminus roots. 



upon. On the innervation of this apparattis, as well as on the sensory nerves 

 of the head in general, we have been enlightened only in recent years 



