right marginal vein right marginal vein the right marginal vein is a vein of the heart running along the inferior margin of the heart. it drains adjacent region of the right ventricle. it usually opens directly into the right atrium, but may sometimes instead empty into the anterior cardiac veins, or (less commonly) the coronary sinus. right marginal veinsternocostal surface of heart (right marginal vein not labeled, but is visible at bottom left)detailsdrains toright atriumarteryright marginal arteryidentifierslatinvena marginalis dextrata98a12.3.01.011ta24167fma4716anatomical terminology the right marginal vein often considered as one of the anterior cardiac veins.