This is a diagram of the left coronary artery and its main branches in the right anterior oblique view. After a short course, the left main coronary artery typically divides into two vessels, the left anterior descending and the circumflex artery. The major branch of the left anterior descending is the diagonal artery. The major branch of the circumflex is the obtuse marginal artery.
Normal left coronary angiogram
This still-frame of a normal left coronary angiogram in the right anterior oblique projection clearly shows the large left main vessel dividing into its two major branches, the left anterior descending and circumflex coronary arteries. The left anterior descending artery gives rise to the diagonal branch and the circumflex artery gives off a very large obtuse marginal branch. In the real-time study that follows, this patient’s normal coronary anatomy is well visualized.