QS Study

The right coronary artery is one of several major vessels that provide blood to the heart. It specifically provides blood to the right atrium, heart ventricles, and the cells in the right atrial wall, which are called the sinoatrial node.


It takes origin from the anterior aortic sinus of ascending aorta.


First, it passes forward and tots the right to emerge between the root of the pulmonary trunk and right auricle.

Then it runs downwards and to the right in the right portion of coronary sulcus to the junction right and inferior surface of the heart.

Then it winds around and continues in the right posterior part of coronary sulcus up to posterior inter-ventricular groove where it ends by anastomosing with the left coronary artery.

Fig: Right Coronary Artery

Branches of the right coronary artery – It divides into smaller branches, including the right posterior descending artery and the acute marginal artery.

  • Right anterior ventricular branch.
  • Right marginal branch.
  • Right posterior ventricular branch.
  • Posterior inter ventricular branch (in 70%).
  • Sino-atrial nodal branch (in 65%).
  • Septal branch.
  • Atrioventricular nodal branch.

Area of distribution

  • A large part of the right ventricle, except the area adjoining the anterior interventricular groove.
  • Most of the right atrium.
  • Part of the left ventricle, near the interventricular septum.
  • Posterior 1/3 rd of the interventricular septum.
  • A sinu-atrial node in 60% of cases.
  • AV node & bundle of His except part of the left branch of AV bundle.
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