Circumflex artery
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The circumflex artery, also known as the circumflex branch, is an artery that comes off of the left coronary artery. The circumflex artery curves to the left around the heart within the coronary sulcus, giving rise to one or more diagonal or "obtuse marginal" branches as it curves toward the posterior surface of the heart. It helps form the posterior left ventricular branch or posterolateral artery. The circumflex artery ends at the point where it joins to form to the posterior interventricular artery in ten percent of all cases, which lies in the posterior interventricular sulcus. In the other 90% of all cases the posterior interventricular artery comes out of the right coronary artery.
