458 COMPARATIVE ANGIOLOGY. 



the other is disposed in,ja mass behind the 'brachial vessels, near 

 the common insertion oF the latissimus dorsi and teres internus ; 

 it receives nine or ten lymphatic branches from the shoulder and 

 arm., The efferents accompany the brachial vessels, and enter 

 the prepectoral glands. 



LYMPHATIC VEIN. 



The second principal trunk is the lymphatic vein, or ditctiLs 

 lymphaticus dexter, a vessel measuring in length from three- 

 quarters to one inch, situated near the junction of the jugular 

 veins, and terminating m their confluent ; it is also guarded by 

 a valve, and receives the lymphatic vessels from the right anterior 

 extremity, and the right side of the head, neck, and thorax. 



COMPARATIVE ANGIOLOGY. 

 EUMINANTIA. 

 In the heart of the ruminant, the most prominent feature --s the pr&sence of 

 the cardiac bones (see p. 105), which appear in adult life. They are two in 

 number, and lie between the auriculo-ventricular rings and the common aorta 

 on the left, the pulmonary artery on the right side. There is a third longi- 

 tudinal furrow running down the wall of the left ventricle posteriorly. The 

 furrows contain more fat as a rule than those of the horse's heart. There 

 are usually nme aortic intercostals, and three anterior ones, or twelve in all. 

 The cceliac axis reaches the rumen just behind the cesophagus. On the left is 

 given off the artery of the reticulum, which passes to the left of the esophagus, 

 and divides into a superior and an inferior branch. Just posterior to this the 

 splenic artery arises, and still farther back the hepatic, which supplies the liver 

 and gall-bladder, giving off the duodenal branch, which anastomoses with the 

 superior artery of the abomasum, and the anterior mesenteric. The terminal 

 branch of the cceliac axis divides and forms a superior and an inferior artery 

 of the psallcrium ayid ahomasum, which pass along the surfaces of these cavities, 

 the former anastomosing with the duodenal. The superior and inferior 

 arteries of the rumen are placed in the longitudinal groove, the former usually 

 arises from the splenic, running backwards ; the latter is generally given off 

 by the artery of the reticulum, and runs forwards and between the anterior 

 sacs, to gain the inferior surface, where it passes backwards and reaches the 

 groove between the conical sacs, anastomosing with the superior vesseL 



The anterior mesenteric artery divides into two branches, an anterior for the 

 small, and a posterior for the largo intestine. The former resembles that of 

 the horse in its distribution ; the latter instead of following the fiexures 

 of the colon gives ^off branches which cross them. The posterior mesenteric 

 artery is small. The middle sacral artery is very large, giving off the arteries 

 of the tail ; it may be regarded as the continuation of the posterior aorta, the 

 lateral sacrals being somewhat rudimentary, and their terminal branches 



