PISCES. 21 



5. Sympathetic nerve. Its origin appears to be first a branch of the fifth ; it 



passes down and becomes connected with the nerve 2, then with the trunk 

 of the par vagtim, and afterwards with each of the spinal nerves. On the 

 left side, after sending a filament to join the trunk of the par vagum on the 

 stomach, it sends a branch across to join its fellow on the right side, in the 

 splanchnic nerve. This forms a ganglionic enlargement on the mesenteric 

 artery ; and, after communicating with the right trunk of the par vagum, 

 terminates in the intestines and other viscera. On each side of the aorta 

 the prolongation of the sympathetic is continued down to the tail, giving 

 filaments to the lateral branches proceeding from the aorta, and commu- 

 nicating with the spinal nerves. Near the anus filaments are sent off, which 

 unite and accompany the spermatic artery to the ovaries. 



6. Junction of the branches from the sympathetic of each side, to form the 



splanchnic nerve. 



7. Spermatic nerves. 



