320 DISSECTION OF THE EABBIT 



b. The left subclavian artery arises from the left side 



of the arch of the aorta : its course and branches 

 correspond to those of the right subclavian. 



c. The intercostal arteries are a series of small paired 



arteries, arising from the dorsal surface of tlie 

 aorta, and running outwards on the inner surface 

 of the thoracic walls, one behind each rib. 



8. Arteries arising from the aorta in the abdomen. 



a. The cceliac artery is a large median vessel, arising 



from the ventral surface of the aorta, about half 

 an inch behind the diaphragm. It runs in the 

 mesentery, and divides into the hepatic aitery 

 supplying the liver, and the lieno-gastric artery 

 supplying the stomach and spleen. 



b. The anterior mesenteric artery is a large median 



vessel, arising from the aorta about three-quarters 

 of an inch behind the coeliac artery. It divides 

 into numerous branches, which run in the mesen- 

 tery to supply the duodenum, pancreas, small in- 

 testine, CEecum, and colon. 



c. The renal arteries are paired, the right one arising 



just behind the anterior mesenteric artery, and 

 the left a little further back. Each gives a small 

 branch to the muscles of the back, and then runs 

 outwards to the kidney. 



d. The spermatic arteries, in /the male, are a pair of 



very small arteries, which arise about a couple of 

 inches behind the left renal artery, and run back- 

 wards and outwards along the dorsal surface of the 

 abdomen to enter the testes at their posterior ends. 

 The ovarian arteries, in the female, correspond 

 in origin to the spermatic, but run outwards and 

 slightly forwards to the ovaries. 



e. The posterior mesenteric artery is a median vessel, 



arising from the aorta about an inch in front of 

 its division into the common iliacs. It supphes 

 the hinder part of the rectum. 



