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The heart, it's cavities and valves. Fig. 1 - Anterior surface of Heart and Pericardial covering., Fig. 2 - Posterior surface of Heart, Auricles, and Ventricales, Fig. 3 - Internal cavities of Ventricals - anterior view, Fig. 4 - Anterior surface of Heart - interior of right auricle exposed, Fig 5 - Interior of right Auricle, Ventrical, and Pulmonary Artery, Fig. 6 - Exterior of left Ventricle and of Aorta, Fig. 7 - Transverse section of Auricles, Aorta, and Pulmonary Artery, immediately above the origins of these vessels, showing the auriculo-ventricular and arterial valves in action, Fig. 8 - Transverse section of Ventricles.