Right coronary sulcus

The right coronary sulcus (right atrioventricular (AV) groove) is the right part of the coronary sulcus on the external surface of the heart that demarcates the boundary between the right atrium and the right ventricle.

The right coronary artery (RCA) courses within this sulcus, running from its origin at the right coronary sinus of the aorta, along the right atrioventricular groove, toward the crux of the heart. Along its course, the RCA gives off branches including the conal branch, sinus node artery, right atrial branches, right ventricular branches (notably the acute marginal branch), and, in most individuals, the posterior descending artery at the crux.

The sulcus also contains the small cardiac vein, which often accompanies the RCA in this region, and is in close proximity to the coronary sinus as it approaches the posterior aspect of the heart.