ITS NERVOUS SYSTEM AND SENSE ORGANS. 



' 93 



frontal ganglion. From this ganglion a recurrent nerve passes 

 backwards through the o?sophageal ring, and ends on the dorsal 

 surface of the crop (*3 inch from the ring), in a triangular 



Fig. 44. Stomato-gastric Xerves of Cockroach, f )'(/., frontal ganglion; at., anten- 

 nary nerve; conn., connective; pa.y., paired ganglia; /.//., recurrent nerve; 

 r.'j., ventricular ganglion. 



ganglion, from which a nerve is given off outwards and back- 

 wards on either side. Each nerve bifurcates, and then breaks 

 up into branches which are distributed to the crop and gizzard.* 

 Just behind the oesophageal ring, the recurrent nerve forms a 



* The stomato-gastric nerves of the Cockroach have been carefully described l>v 

 Koestler (Zeits. f. wiss. Zool., Bd. XXXIX., p. 592). 



