194 



COMPARATIVE ANATOMY 



XT 



Fie. 14.1. THE ENTIRE NERVOUS SYSTEM OF THE FROG. 



From the ventral side. 



(After A. Ecker.) 



/', facial nerve ; G, ganglion of the vagus ; He, cerebral hemispheres ; 7 to A', first 

 to tenth eerebral nerves; Lop, optic lobes; M, spinal cord; Ml to J/ln, 

 spinal nerves, which are connected at SM by branches (ranii communicantcs) 

 with the ganglia (SI toSlO) of the sympathetic (>s r ) ; A r , nasal sac ; Ni, sciatic 

 nerve ; No, femoral nei^ve ; o, eye ; Va to Ve, the different branches of the tri- 

 geminal ; Vy, Gasserian ganglion ; Fx, connection of the sympathetic with the 

 < iasserian ganglion ; A'l to A'4, the different brandies of the vagus. Some of the 

 fibres of the sympathetic should be shown accompanying the vagus peripherally. 



