70 



join, and then this nerve runs along the ventra] side of 

 fclie oesophagus down to the gastric ganglion. These two 

 nerves give off branches to the oesophagus all along 

 their course, and specially important ones alongside the 



crop. 



The Gastric Ganglion is the posterior centre of 

 the visceral nervous system, and lies on the ventral 

 surface of the alimentary canal, just where the intestine 

 and spiral caecum lead out of the stomach. It is 

 triangular, about the size of a wheat grain, and is exposed 

 on turning forward the liver (PI. V, fig. 38 a, and PL IX, 

 fig. 73, G.g.). 



A. From its right upper coiner it gives off: — -(1) A 

 large nerve which runs up over the ventral surface of the 

 posterior part of the oesophagus, giving off several 

 branches to the wall on its way (fig. 73, a), continues its 

 course along the oesophagus, and ends in the sub- 

 oesophageal ganglion as previously described ; (2) several 

 short branching nerves to the base of the oesophagus, and 

 to the ventral wall of the stomach (fig. To, b) ; (3) a large 

 nerve which runs along' the groove marking the division 

 between oesophagus and stomach, and gives off small 

 branches on its way, ending by running round the right 

 side of the stomach to its dorsal border (fig. 73, c). 



13. From the left upper corner are given off: (1) A 

 large intestinal nerve which runs along to the anus 

 (fig. 73, e) ; (2) several small nerves which end in the 

 walls of the initial part of the intestine (fig. 73, /). 



C. From the third and lowest angle of the gastric 

 ganglion are given off: — (1) Several branching nerves to 

 the spiral caecum (fig. 73, g) ; (2) two large and several 

 smaller nerves to the paired hepatic ducts (fig. 73, h). 

 These run upwards into the liver. 



The large intestinal nerve, from analogy with Sepia., 



