Which vessel travels in the coronary sulcus along the posterior surface and supplies the right atrium and ventricle?

• A. Right Coronary Artery
• B. Circumflex Artery
• C. Left Coronary Artery
• D. Left Subclavian Artery

Answer: (A)

The vessel in the coronary sulcus that runs along the posterior surface and supplies the right atrium and ventricle is the right coronary artery. It travels in the right coronary sulcus (atrioventricular groove) around the heart and, on the posterior side, gives branches such as the posterior interventricular (posterior descending) artery and marginal arteries that largely feed the right atrium and right ventricle. It also commonly gives an AV nodal branch. By contrast, the circumflex artery stays in the left-sided coronary groove to supply the left atrium and left ventricle, the left coronary artery divides to supply the left side, and the left subclavian artery is not a cardiac artery.