Identify the coronary arteries and cardiac veins on the surface of the heart. (G 3.43;N 215;Gl 9.16)

1. Identify the anterior interventricular artery and great cardiac vein. Identify the left coronary artery arising from the ascending aorta. Identify the circumflex branch of the left coronary artery. Identify the left marginal branch of the circumflex artery. Attempt to identify the left posterior ventricular vein. (G 3.49;N 215;Gl 9.16) The point where the left posterior ventricular vein joins the great cardiac vein is the origin of the coronary sinus.
2. Identify the right coronary artery. Attempt to identify one or more anterior cardiac veins crossing the right coronary artery where they drain directly into the right atrium. Attempt to identify a few delicate atrial rami arising from the right coronary artery. Continue tracing the right coronary artery to the posterior aspect of the heart. Identify the right marginal branch and the posterior interventricular artery. Attempt to identify the small cardiac vein traveling with the right coronary artery. Identify the middle cardiac vein where it drains into the coronary sinus. It is not unusual to observe variation in the branching patterns of the coronary arteries including the posterior interventricular artery arising from the circumflex branch of the left coronary artery.