Your Coronary Arteries

The Major Arteries

Arteries carry oxygen-rich blood from the heart to the body's tissues. The heart receives its own supply of blood from the coronary arteries. This enables the heart to do the work of pumping.

Major Coronary Arteries That Feed the Heart

  1. The left anterior descending—also known as LAD—directs blood flow to the front and left side of the heart muscle, including the entire left ventricle.
  2. The right coronary artery—also known as RCA—directs blood flow to the bottom and right side of the heart muscle.
  3. The circumflex artery directs blood flow to the back and left side of the heart muscle.

Right Coronary Artery (RCA)

The right coronary artery branches into:

  • Right marginal artery
  • Posterior descending artery

The right coronary artery supplies:

  • Right atrium
  • Right ventricle
  • Bottom portion of both ventricles and back of the septum

The main portion of the right coronary artery provides blood to the right side of the heart, which pumps blood to the lungs. The rest of the right coronary artery and its main branch, the posterior descending artery, together with the branches of the circumflex artery, run across the surface of the heart's underside, supplying the bottom portion of the left ventricle and back of the septum.

Left Main Coronary Artery (LMCA)

The left main coronary artery branches into:

  • Circumflex artery
  • Left anterior descending artery (LAD)

The left coronary arteries supply:

  • Circumflex artery - supplies blood to the left atrium, side and back of the left ventricle left anterior descending artery (LAD) - supplies the front and bottom of the left ventricle and the front of the septum

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