in summary, the Cx travels in the left atrioventricular (AIV) groove
between the left atrium and left ventricle, as it wraps around to the
back or posterior portion of the heart.
OM or obtuse marginal coronary arteries are given off in the proximal
or early course of the artery, while the postero-lateral coronary arteries
arise from the distal portion of the Cx.
85% of cases, the Cx is non-dominant, while the "dominant" RCA supplies
the PDA branch. In the other 15% of cases, a dominant Cx supplies the