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The left main coronary artery arises from above the left portion of the aortic valve and then usually divides into two branches, known as the left anterior descending (LAD) and the circumflex (Circ) coronary arteries. In some patients, a third branch arises in between the LAD and the Circ.
Introducing your coronary arteries. The LAD comes down the front of the heart, the circumflex coronary artery comes around the side of the heart, and the right coronary artery or RCA comes around the back of the heart. The LAD supplies blood to the front and the bottom of the heartâs left ventricle, and to the front of the septum.