Left Coronary Artery

• Origin and course
  • Arises from the ascending aorta
  • The left coronary artery ends by dividing almost immediately into two large branches, the anterior descending and the circumflex
• Branches
  • The anterior descending branch passes over the front of the heart toward the tip. 
  • The circumflex branch lies in a groove between the left atrium and left ventricle.
    • They cross over the heart's surface, dividing and sending tiny branches into the heart muscle. 
• Supplies
  • Left ventricle. 
    • The anterior descending branch supplies the front surface and tip of the heart and the front part of the septum. 
    • The circumflex branch supplies the portion of the left ventricular wall away from the septum.

Right Coronary Artery

• Origin and course
  • Arises from
  • The right coronary artery lies in a groove between the right atrium and right ventricle and loops around the lower side and to the rear of the heart
• Branches
  • From the large coronary vessels, smaller branches arise, which divide and insert into the heart muscle
• Supplies
  • Muscle of the right ventricle.