Anatomy of the human heart viewed respectively from the front and behind. On the left, the left and right coronary arteries arise from the ascending aorta. Cardiac veins are also noted. On the right the cardiac veins drain into the large coronary venous sinus which empties into the right atrium. From Sobotta, J. (1906) Atlas der deskriptiven Anatomie des Menschen. Vol 3, Das Nerven- und Gefasssystem des Menschen. J. F. Lehmann, Munchen, Figs. 446, 447.