The blood supply of the heart  

Supplied by the left and right coronary arteries which originate From the left and right coronary sinuses of the aorta respectively.


Branches and distribution

Right coronary artery
  • Posterior interventricular
  • Marginal
  • AV modal artery
  • Right atrium
  • Right ventricle
  • AV node and bundle
  • SA node
  • Variable amount of left atrium and ventricle

Left coronary artery
  • Anterior interventricular
  • Circumflex
  • Both ventricles, and the interventricular septum.
  • Left atrium
  • Sino Atrial node


Variations in coronary arteries:
  • In about 50% the cases, the right coronary artery is dominant i.e. it crosses to the left side, and supplies the left ventricle, and the interventricular septum.

  • In about 20% of cases, the left coronary artery is dominant. In addition to supplying the left ventricle, and the interventricular septum, it sends branches to the right ventricular wall.

  • In about 30% of the cases, the coronary arterial pattern is balanced. There may be only one coronary artery.

  • In about 4% of hearts, there are accessory coronary arteries

  • A 3rd coronary artery may be present in upto 35% of individuals

There is thus, no sharp line of demarcation between the ventricular distribution of the coronary arteries.


Extracardiac Anastomosis
  • The anastomosis between the coronary arteries and extra-cardiac vessels exist e.g.

    pericardial arteries
    internal thoracic

    superior phrenic



Chapter 29: The Middle Mediastinum, Heart and Pericardium and the Superior Mediastinum

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