Ventricle and Aorta Laid Open
The left ventricle and the commencement of the aorta laid open. Mpm, Mpl, the papillary muscles. From their upper ends are seen the cordoe tendineoe proceeding to the edges of the flaps of the mitral valve. The opening into the auricle lies between these flaps. At the beginning of the aorta are seen its three pouch-like semilunar valves.
Martin, H. Newell & Martin, Ernest G. The Human Body: An Account of Its Structure and Activities and the Conditions of its Healthy Working (New York: Henry Holt and Company, 1917) 329