heart great cardiac vein

great cardiac vein, heart anatomy, coronary sinus, oblique sinus, image, posterior view of the heart, Cardiac Anatomy, posterior cardiac vein, middle cardiac vein, Anatomy of the Heart, great cardiac vein, small cardiac vein, posterior view of heart, oblique vein of left atrium, heart anatomy, posterior heart anatomy, external anatomy of the heart, posterior heart, POSTERIOR view of the heart, Coronary Sinus,