974 



A MANUAL OF ANATOMY 



ternal indication of this division is the interventricular groove, 

 which corresponds to the attachment of the interventricular 

 septum in the interior. This groove consists of two parts, antero- 

 superior and inferior. The aniero-superior interventricular groove 

 extends over the antero- superior surface of the heart from the left 

 side of the root of the pulmonary artery to the inferior border, or 

 margo acutus, to the right of, and near, the apex. At this point 

 it becomes continuous with the inferior interventricular groove. It 

 contains, besides fat, (i) the descending branch of the left coronary 

 artery, and (2) a part of the great cardiac or coronary vein (more 



Pulmonary Artery 



Left Pulmonary Veins -- 'J 



Great Cardiac Vein -j 



Left Ventricle 



Superior Vena Cava 



Right Pulmonary 

 Veins 



... Right Auricle 



Inferior Vena Cava 

 Coronary Sinus 



.. Right Coronary Artery 



Right Ventricle 



The Heart (Posterior View). 



properly called the antero - superior interventricular vein in this 

 region). The inferior interventricular groove is situated on the in- 

 ferior surface of the heart, and, as stated, is continuous with the 

 preceding. It contains, besides fat, (i) the descending (inferior) 

 branch of the right coronary artery, and (2) the middle cardiac 

 vein (more properly called the inferior interventricular vein). 



The ventricular portion of the heart presents an apex, a base, 

 two surfaces, and two borders. The apex is directed downwards, 

 forwards, and to the left, and forms the apex of the heart. The 

 left ventricle alone enters into its formation. The base is directed 

 upwards, backwards, and to the right, and is connected with the 



