86 



THORAX 



From the stem of the left coronary artery twigs are given to 

 the roots of the pulmonary artery and the aorta, and its 

 terminal branches supply the walls of both ventricles and the 

 walls of the left atrium. 



The dissectors should note that the two coronary arteries 

 are the only arteries which supply blood to the walls of the 



Right 



innominate vein 

 Innominate artery 



Superior vena cava 



Apex of right auricle 

 (O.T. appendix) 



Marginal branch 



of right coronary 



artery 



Right ventricle 



Left common carotid 



Left subclavian 



- Left innominate vein 



- Aortic arch 



- Ligamentum arteriosum 



Left pulmonary artery 

 Pulmonary artery 



Left auricle (O.T. appendix) 

 Conus arteriosus 



Anterior interveii- 

 tricular furrow with 

 the interventricular 

 branch of the left coro- 

 nary artery and the 

 great cardiac vein 



Left ventricle 



Apex of heart 



FIG. 39. Sterno-costal Surface of the Heart. 



heart, and that they form no effective anastomoses with any 

 other arteries. Therefore, if they are obliterated, the blood 

 supply to the walls of the heart is stopped and death must 

 ensue. Occasionally there are three coronary arteries, one from 

 each aoriic sinus, and sometimes there is only one coronary 

 artery, which may be either the right or the left. 



Venae Cordis. The cardiac veins are: (i) the coronary 

 sinus; (2) the great cardiac vein; (3) the inferior (posterior) 



