Right coronary aa.

The right coronary artery (RCA) is an artery originating above the right cusp of the aortic valve. It travels down the coronary (atrioventricular) groove. Its branches include the posterior descending (posterior interventricular) artery that travels in the posterior interventricular sulcus, and the right marginal artery that courses along the anterior inferior margin of the heart towards the apex.

In addition to supplying blood to the right ventricle (RV), the RCA supplies 25% to 35% of the left ventricle (LV).

In 85% of patients (Right Dominant), the RCA gives off the posterior descending artery (PDA). In the other 15% of cases (Left Dominant), the PDA is given off by the circumflex branch of the left coronary artery. The PDA supplies the inferior wall, ventricular septum, and the posteromedial papillary muscle.