FIG. 167.- NERVOUS SYSTEM OF FROG (VENTRAL ASPECT). (Ecker) 



N 



F, facial nerve; c. 

 gang ion on x ; 

 H e, cerebrum ; 

 Lr, optic tract ; 

 L0/$, optic lobe ; 

 M, boundary be- 

 tween medulla 

 and spinal cord ; 

 MI- 10, spinal 

 nerves; MS, con- 

 nection between 

 4th spinal nerve 

 and sympathetic 

 chain ; N, nasal 

 sac ; NZ, sciatic 

 nerve ; i^ o, crural 

 nerve ; ff, eyeball ; 

 s, sympathetic 

 trunk ; s i - 10 

 .sympathetic gan- 

 glia; ^ s/, con- 

 tinuation of sym- 

 pathetic into 

 head. The num- 

 bers refer to the 

 cranial nerves 

 (see table on p. 



5? 



