i88 



Descriptive Zoology. 



share of the space in the body cavity. The eggs finally are 

 set free in the body cavity ; they find their way to the open- 



Nasal sac .. 



Eye 



Branches connecting .'' 

 t 



Sympathetic gan- 

 glion 



Olfactory nerve 



Optic nerve 



Ganglion of fifth 



nerve 



Fifth nerve 

 Ganglion of vagus 



nerve 

 Vagus nerve 



First spinal nerve 

 Brachial nerve (arm) 



Sympathetic nerve 

 trunk 



Sympathetic gan- 

 ; glions 



Sciatic nerve (thigh) 



FIG. 118. NERVOUS SYSTEM OF FROG, VENTRAL VIEW. 



