ARTERIAL SYSTEM 



231 



and backwards in the body-wall and along 

 the hinder border of the pectoral girdle -to 

 the pectoral fins, which they supply. 



ii. The coeliac artery is a large median vessel 

 arising from the ventral surface of the aorta, 

 about half an inch behind the openings of the 

 last pair of efferent branchial vessels. It runs 

 backwards in the mesentery close to the dorsal 

 surface of the stomach, and divides into two 



FIG. 40. Scy Ilium canicula. Transverse section passing through the 

 posterior dorsal fin. (A. M. M.) 



A, horny fibre. B, fin-ray of the dorsal fin. C, myotomes. D, neural 

 spine. E, base of neural arch. F, notochord. Gr, calcified portion of centrum. 

 H, haemal arch. I, spinal cord. TC, lateral_vein. L, caudal artery. M, caudal 

 vein. 



main branches, one of which supplies the 

 proximal end of the stomach and the liver,, 

 and the other the first part of the intestine 

 and the pancreas. 



iii. The mesenteric artery is a median vessel arising 

 from the aorta about an inch and a half behind 



