706 



THE BLOOD-VASCULAR SYSTEM OF THE OX 



is in apposition with the atrio-ventricular rings, and is irregularly triangular in 

 form. Its left face is concave and gives attachment to the right posterior cusp of 

 the aortic valve. The right surface is convex from before backward. The base 

 is dorsal. The posterior border bears two projections separated by a notch. It 

 is usually a little more than an inch (ca. 4 cm.) in length. The left bone is smaller 

 and is inconstant. Its concave right border gives attachment to the left posterior 

 cusp of the aortic valve. There is a large muscular moderator band in the right 



Aorta 



Anterior vena- 

 cava 



Brachiocephali 

 trunk 



Right auricle 



Pulmonary artery 



Ligamentum arteriosmn 



Left branch of pulmonary artery 

 Pulmonary veins 



Posterior vena cava 



Right renlrich' 

 Left coronary artiry 



Vena hemiazygos 

 Left auricle 



Posterior branch of left 

 coronary artery in 

 intermediate groove 

 Left ventricle 



Fig. 592. — Heart of Ox; Left View. 

 The ventricles are contracted. 



ventricle, which extends from the base of the anterior septal papillary muscle to the 

 lateral wall at the base of the papillary muscle there. In the left ventricle there 

 are several branched moderator bands. 



The Arteries 1 



The great arterial trunks in the thorax resemble those of the horse in general 

 disposition. 



1 Only the most important differential features of the arrangement of the vessels as compared 

 with those of the horse will be considered. 



