A Diagram of the Heart
The left auricle and ventricle opened and a part of their anterior and left walls removed. The pulmonary artery has been divided at its commencement; the opening into the left ventricle is carried a short distance into the aorta between two of the segments of the semilunar valves; and the left part of the auricle with its appendix has been removed. The right auricle is out of view. Labels: 1, the two right pulmonary veins cut short; their opening are seen within the auricle; 1' , placed within the cavity of the auricle on the left side of the septum and on the right side and on the part which forms the remains of the valve of the foramen ovale, of which the crescentic fold is seen towards the left hand of 1'; 2, a narrow portion of the wall of the auricle and ventricle preserved round the auriculo-ventricular orifice; 3, 3', the cut surface of the walls of the ventricle, seen to become very much thinner towards 3", at the apex; 4, a small part of the anterior wall of the left ventricle which has been preserved with the principle anterior columna carnea or musculus papillaris attached to it; 5. ,musculi papillares; 5', the left side of the septum, between the two ventricles, within the cavity of the left ventricle; and above the three segments of its semilunar valve which are hanging loosely together; 7', the exterior of the great aortic sinus; 8, the root of the pulmonary artery and its semilunar valves; 8' the separated portion of the pulmonary artery remaining attached to the aorta by 9, the cord of the ductus arteriosus; 10, the arteries rising from the summit of the aortic arch.