The heart has 3 major coronary arteries. Two of these arteries arise from a common stem, called the left main coronary artery. Below is a picture of a normal human heart. Coronary arteries lay initially on the surface of the heart before they dive deep and eventually reach the muscle cells:
- The left main coronary artery supplies the left side of the heart.
- Its left anterior descending (LAD) branch supplies the front part of the heart.
- The left circumflex (LCX) branch supplies the left lateral and back side of the heart.
- Finally, the right coronary artery (RCA) is separate and supplies the right and the bottom parts of the heart.
Look at this animation of the coronary arteries: