File:EB1911 - Vascular System - Fig. 15.png

English: Fig. 15.—The Right Auricle and Ventricle of a Calf's Heart, exposed to show the course and connexions of the auriculo-ventricular bundle. 1, central cartilage exposed by dissection; 2, the main bundle; 3, auricular fibres from which the main bundle arises; 4, right septal division; 5, moderator band; 6, a cusp of the tricuspid valve; 7, posterior group of the musculi papillaries; 8, orifice of the coronary sinus; 9, above orifice of the inferior vena cava (10); 11, orifice of the superior vena cava; 12, septal wall of the right auricle; 13, appendix of the right auricle; 14, septal wall of the infundibulum; 15, beginning of the pulmonary artery; 16, apex of the right ventricle. (After A. Keith, in Journal of Anatomy and Physiology.)