Like all organs, your heart is made of tissue and requires a supply of oxygen and nutrients. Although its chambers are full of blood, the heart receives no nourishment from this blood. The heart receives its own supply of blood from a network of arteries, called the coronary arteries.
Two major coronary arteries branch off from the aorta near the point where the aorta and the left ventricle meet:
the right coronary artery (RCA) which supplies the right atrium and right ventricle. It branches into the posterior descending artery which supplies the bottom portion of the left ventricle and back of the septum.
the left main coronary artery, which branches into:
the circumflex artery, which supplies blood to the left atrium, side and back of the left ventricle
the left anterior descending artery (LAD), which supplies the front and bottom of the left ventricle and the front of the septum
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