566 



BLOOD-VASCULAR SYSTEM OF THE HORSE 



trunk. They supply the crura of the diaphragm. In some cases they arise in 

 common -^-ith an intercostal artery. 



BRANCHES OF THE ABDOMINAL AORTA 



The collateral branches of the abdominal part of the aorta are distributed 

 chiefly to the walls and contents of the abdominal cavity, but some branches are 

 supplied to the spinal cord and its membranes, and others extend into the pelvis 

 and to the scrotum. The visceral branches are the coelikc, anterior mesenteric, 

 renal, posterior mesenteric, and the spermatic or utero-ovarian. The parietal 

 branches are the lumbar arteries. 



Fig. 44S. — Plan of Branches of Cu;i.iac Artery of Horse. 

 1, Coeliac artery; 2, gastric artery; 3, hepatic artery; 4, splenic artery; 6, posterior gastric artery; 6, an- 

 terior gastric artery; 7, oesophageal branch; S, gastro-duodenal arter.v; 9, pancreatico-duodenal artery; /O, right 

 gastro-epiploic artery; 11 , pyloric artery; 12, left gastro-ejjiploic artery; IS, short gastric branches of splenic. 



I. The coeliac artery or axis (A. coeliaca) is an unpaired vessel, usually half an 

 inch or less (ca. 1 cm.) in lonsth, which arises from the ventral aspect of the aorta 

 at its emergence from the hiatus aorticus. It divides on the dorsal surface of the 

 pancreas into three branches — the gastric, hepatic, and splenic. 



1. The gastric artery (A. gastrica sinistra) passes downward and forward in 

 the gastro-phreiiic ligament, gives off oesophageal and pancreatic branches, and 

 divides al)ove and Ix'liiiid the cardia into anttTJor and jiosterior branches. 



(a) The anterior branch (Ranms cranialis) crosses the lesser curvature just to 

 the right of the cardia and ramifies on the parietal surface of the stomach. The 

 branches pursue a flexuous course toward the greater curvature and anastomose 

 with the short gastric arteries and the gastric branch of the hepatic artery. 



{h) The posterior branch (Ramus cautlalis) is distributed in a similar fashion 

 on the visceral surface. 



