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17. Arteriogram — L. coronary artery, RAO projection

In this projection the broad surface of the interventricular septum is facing the viewer, and the apex is pointing to the viewer's right.

The L. coronary artery arises from the left aortic sinus, and divides in the atrioventricular groove into an anterior interventricular branch and a circumflex branch; the former descends to the apex in the anterior interventricular groove, supplying both ventricles, and anastomosing with the posterior interventricular branch of the R. coronary artery after passing around the apex. The circumflex branch winds around the left margin of the heart, supplying the L. atrium and L. ventricle. It ends by anastomosing with the R. coronary artery.