The<unk>  normally arises from the aortic sinus above the left cusp of the aortic valve.  The origin of the<unk>  is called the left main coronary artery, and it bifurcates into the left anterior descending and the left circumflex artery.  This artery supplies the majority of the blood flow to the left ventricle, the pumping chamber of the heart.  In fact, the<unk>  supplies the posterolateral side of the left ventricle as well as the anterior part of the left ventricle which includes the anterolateral myocardium, the apex, the anterior interventricular septum and the anterolateral papillary muscle.
Left coronary artery
Right coronary artery
Left main coronary artery
Left anterior descending artery
Left circumflex artery
Atrioventricular nodal branch
Right marginal branch of right coronary artery
Ascending aorta