Interior of the Heart
Diagram of the interior of the heart. Labels: A, aorta; PA, pulmonary artery; VCI and VCS, vena cava inferior and vena cava superior; T, tricuspid, and M, mitral valve. The other letters same as in preceding figure.
Jenkins, Oliver P. Primary Lessons in Human Physiology (Indianapolis: Indiana School Book Company, 1891) 66
Courtesy the private collection of Roy Winkelman