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Next, identify the grooves on the surface of the heart which indicate the positions of the septa which separate the chambers of the heart. The coronary arteries and their major branches lie in these grooves.
The coronary sulcus, or atrioventricular groove, passes around the heart and separates the ventricles from the atria.The interventricular groove, is anatomically divided into the anterior interventricular groove and posterior interventricular groove. These grooves are perpendicular to the coronary sulcus and indicate the position of the interventricular septum.
Links and References:
Grant's: 1.61
Netter: 203
Rohen/Yokochi: 254, 255