The branches of the left coronary artery are  anterio interventricular artery (AIV artery) and circumflex artery which is considered to be the continuation of the left coronary artery. It gives rise to the left marginal artery and also few branches for the supply of the posterior surface of the left atrium and left ventricle. Anterior interventricular branch of the left coronary artery supplies the left anterior surface of the left ventricle including the apex, adjoining part of the left ventricle and anterior two-third of the IV septum. The anterior interventricular artery runs along the anterior interventricular sulcus, turns around the inferior border of the heart and anastamoses with the posterior interventricular branch of the right coronary artery. The AIV artery sends a few branches to the anterior surface of the left ventricle. The largest among these is called the diagonal artery. All these arteries arise at an acute angle so that they can are most susceptible to blockage by emboli.