986 



A MANUAL OF ANATOMY 



exception of the last-named cardiac veins (vense minimae cordis), all 

 the others are seen upon the exterior of the heart. 



The great or left cardiac or coronary vein commences at 

 the apex of the heart, and ascends in the antero-superior inter- 

 ventricular groove alongside of the descending branch of the left 

 coronary artery. In this part of its course it is more properly 

 called the antero-superior interventricular vein. It is of large size, 

 and receives tributaries from both ventricles and from the inter- 



FiG. 406. — Diagram showing the Position of the Heart and its Valvular 

 Orifices in relation to the Anterior Wall of the Thorax. 



R.A. Right Auricle 

 R.V. Right Ventricle 

 L. A. Left Auricle 

 L.V. Left Ventricle 

 A.A. Arch of Aorta 

 In. Innominate Artery 



R.S. Right Subclavian Artery 

 R.C.C. Right Common Carotid Artery 

 L.C.C. Left Common Carotid Artery 



L.S. Left Subclavian Artery 

 S.V.C. Superior Vena Cava 



Numbers on Sternum. 



1. Tricuspid Orifice 



2. Pulmonary Orifice 



3. Mitral Orifice 



4. .\ortic Orifice 



ventricular septum. On reaching the auriculo-ventricular groove, 

 it enters the left division of that groove, in which it courses along 

 with the transverse branch of the left coronary artery. Having 

 turned round the left margin of the heart, it joins the left extremity 

 of the coronary sinus, with which it is continuous. The name 

 coronary is strictly applicable to this vessel only where it lies in 

 the left auriculo-ventricular groove. 

 The coronary sinus (see Fig. 398, p. 974) is the dilated terminal 



