Frontal illustration of the heart (on the left), and its coronary circulation, with the common trunk of the left coronary artery shown in orange with the circumflex artery leading off it. The right coronary artery leads to the auricular artery, then the sinus node artery. Rear illustration of the heart (on the right) and its circulation, with the left retro ventricular artery leading to the right marginal artery and the posterior inter ventricular artery.