The right auricle (atrium) and ventricle of the heart opened, and a part of their right and anterior walls removed, so as to show their interior; 1/2, 1, superior vena cava; 2, inferior vena cava; 2', hepatic veins cut short; 3, right auricle; 3', placed in the fossa ovalis, below which is the Eustachian valve; 3", is placed close to the aperture of the coronary vein; +, +, placed n the auriculo-ventricular groove, where a narrow portion of the adjacent walls of the auricle and ventricle has been preserved; 4, 4, cavity of the right ventricle; the upper figure is immediately below the semilunar valves; 4', large columna carnea or musculus papillaris; 5, 5', 5", tricuspid valve; 6, placed in the interior o the pulmonary artery, a part of the anterior wall of that vessel having been removed, and a narrow portion of it preserved at its commencement where the semilunar valves are attached; 7, concavity of the aortic arch close to the cord of the ductus arteriosus; 8, ascending part of sinus of the arch covered at its commencement by the auricular appendix and pulmonary artery; 9, placed between the innominate and left carotid arteries; 10, appendix of the left auricle; 11, 11, the outside of the left ventricle, the lower figure near the apex.

Right Atrium and Ventricle of the Heart

The right auricle (atrium) and ventricle of the heart opened, and a part of their right and anterior…

Right side of heart. Labels: A, cavity of right ventricle; B, superior vena cava; C, inferior vena cava; a, wall of right ventricle; b, c, columnae carneae; d, pulmonary vein; e, f, tricuspid valve; m, semilunar valve; o, wall of left ventricle; p, q, v, ascending aorta, arch and descending aorta.

Right Side of Heart

Right side of heart. Labels: A, cavity of right ventricle; B, superior vena cava; C, inferior vena cava;…

Section of heart at level of valves. Labels: P, pulmonary artery, with flaps of semilunar valve open; A, aorta, with flaps of semilunar valve open; M, closed mitral valve; T, closed tricuspid valve.

Section of Heart Showing Valves

Section of heart at level of valves. Labels: P, pulmonary artery, with flaps of semilunar valve open;…

Section of the aorta, to show the action of the semilunar valve. A is intended to show the valves, represented by the dotted lines, lying near the arterial walls, represented by the continuous outer line. B (after Hunter) shows the arterial wall distended into three pouched (a), and drawn away from the valves, which are straightened into the form of an equilateral triangle, as represented by the dotted line.

Action of Semilunar Valve

Section of the aorta, to show the action of the semilunar valve. A is intended to show the valves, represented…