The Left Coronary Artery

• • Left coronary artery circles the heart to the left within the coronary sulcus. The left coronary artery has a larger diameter and supplies more of the heart with blood than the right coronary artery. The left coronary artery gives off four major branches: the anterior interventricular, circumflex, left marginal, and posterior interventricular branches.
• In most individuals, the lumen of the left coronary artery (LCA) is larger in diameter than the lumen of the right coronary artery
• The left coronary artery (LCA) supplies blood to

  • most of left ventricle
  • small segment of right ventricle
  • most of left atrium
  • anterior two thirds of interventricular septum
• The anterior interventricular branch, or left anterior descending branch, is a large artery running along the anterior surface within the anterior interventricular sulcus
• The circumflex branch curves to the left within the coronary sulcus
• In most individuals the left coronary artery forms the left marginal branch
• Upon reaching the posterior surface of the heart, the right coronary artery forms the posterior left ventricular branch
• In some cases, the posterior left ventricular branch is replaced by the posterior interventricular branch of the circumflex artery
• Interconnections between coronary arteries are visible in various locations on the ventricles of the heart. Such interconnections are called anastomoses