THORACIC CAVITY 



61 



inferior longitudinal sulcus on the diaphragmatic surface of 

 the heart, and it anastomoses with the interventricular or 

 descending branch of the left coronary artery at the cardiac 

 notch on the lower margin of the heart. In addition to its 

 terminal branches, the right coronary artery supplies branches 

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



Left 



pulmonary 

 artery 



Pulmonary artery 



Interventricular 

 branch of left 

 coronary artery 

 Left posterior sinus 

 of aorta 

 Circumflex 

 branch of left 

 coronary artery 



Anterior cusp of 

 mitral valve 



Posterior cu.< 



Ligamentum arteriosum 



Pulmonary artery 

 -Aorta 



Right pulmonary artery 



Conus arteriosus 



Right coronary artery 



Right posterior sinus 

 of aorta 



Anterior cusp 

 of tricuspid valve 



Inferior cusp 

 Medial cusp 



rginal branch 

 Interventricular branch of right coronary artery 



FIG. 28. The Base of the Ventricular Part of the Heart from which the 

 Atria have been removed. The detached atria are depicted in Fig. 

 31. The specimen was-hardened in situ. 



the walls of the right atrium and the right ventricle, the 

 larger and more numerous branches being given to the 

 ventricle. One of the latter, the marginal branch, passes 

 along the lower margin of the heart towards the apex of the 

 ventricle (see Fig. 29). 



The left coronary artery, as it springs from the left 

 posterior aortic sinus (Fig. 28), lies posterior to the pulmonary 

 artery. For a short distance it runs to the left, then it turns 

 anteriorly, between the pulmonary artery and the left auricle, 



