Front View (Anterior) of the Heart

Front View of the Heart

Outside View of the Back (Posterior) of the Heart

Coronary veins (in blue) -take oxygen-poor ("deoxygenated") blood that has already been "used" by muscles of the heart and returns it to the right atrium

Circumflex artery - supplies blood to the left atrium and the side and back of the left ventricle

Pulmonary veins - bring oxygen-rich blood back to the heart from the lungs

Outside View of the Back (Posterior) of the Heart)