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 



Cerebrum 



Spinal bulb 



t 



Boundary between 



I 

 Spinal cord - 



Spinal nerves ,. 



Branches connecting ,' 

 t 



Sympathetic gan- *' 

 glions 



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. 



