The first branch of the right coronary artery is the conus arteriosus, also known as the right conus artery. In some cases, it arises directly from the right coronary sinus, in which case, it is referred to as the third coronary artery.

The proximal segment of the right coronary artery also gives rise to the right anterior ventricular and atrial branches.

The atrial branches of the right coronary artery can be grouped into posterior, marginal (lateral) and anterior branches. The right marginal and anterior divisions often occur as paired arteries that supply the right atrium, while the posterior atrial division is usually solitary and supplies both right and left atria. The anterior division also gives rise to the sinoatrial node artery.

There are about two or three right anterior ventricular branches travelling toward the apex and arborizing gradually. These arteries supply the sternocostal part of the right ventricle.

The middle portion of the right coronary artery also gives rise to two or three posterior ventricular arteries, which supply the diaphragmatic part of the right ventricle.

Further during its course, the right coronary artery gives off the right marginal artery, which supplies both sternocostal and diaphragmatic surfaces of the right ventricle.

The distal part of the right coronary artery curves across the inferior margin of the heart in the diaphragmatic interventricular groove. Upon reaching the cardiac crux, the artery turns to descend within the interventricular groove and now is referred to as the posterior interventricular or posterior descending artery. This artery continues down the diaphragmatic surface reaching the apex, where it joins with the anterior interventricular (descending) artery arising from the left coronary artery. Along its course, the posterior descending artery gives rise to septal branches to supply the posterior third of the interventricular septum.

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Branches of the right coronary artery (RCA)