Fig. I20. Heart of Adult, Ventricles Opened. 



Normal adult heart liardened in for mot ; the ventricle is opened so as to shew 

 the Aortic and Pulmonary serni/iinar valves, the heart is rotated so that tlie 



Left Ventricle is more to tlie front. 



TIte figure is senti-diagrai>unatic in order to demonstrate more clearly all th 



valves of the heart and their relative positions. 



The figure shews the outer and anterior aspects of the Right Auricle, the 

 Right Auricular appendage and the opening of the Superior Vena Cava. 



Right Ventricle : Papillary Muscles, Anterior, Posterior and Septal. Chordae 

 Tendineae, 3 Cusps of the Tricuspid valve, one large Anterior, a large Posterior 

 and a small Septal Cu.sp; between the two Ventricles the Inter-Ventricular Septum; 

 on the Anterior aspect of the Heart the inter-ventricular groove, terminating in 

 the Cardiac Notch, and the Descending Branch of the Left Coronary Artery. 



As the continuation of the Right Ventricle upwards (the Conus Arteriosus) 

 has been widely opened and its left wall removed, the pulmonary semilunar valves 

 appear to be completely disconnected from the Right Ventricle, but their relative 

 positions are well shewn, one anterior, one right and one left. 



Left Ventricle: Papillary Muscles, anterior or left and posterior or right 

 with chordae tendineae attached to the two cusps of the mitral valve (right or 

 aortic cusp and posterior or left cusp), the right one extending up into the Aorta 

 and almost in continuity with the semilunar valve. 



The Aortic Valves are three in number, like the pulmonary, one is posterior, 

 two are anterior or right and left, this is due to the common developmental 

 origin of the Aorta and Pulmonary Artery. 



The Aortic Valves lie (cf. Fig. 119) more to the right, at a lower level 

 and posterior to the Pulmonar}' Valves. 



Because the Aortic Valves are situated deepl}' and at a considerable 

 distance from the Anterior Thoracic Wall, to obviate the obliterating effect of 

 the Pulmonar}' Valves the Stethoscope is applied over the 2nd right Intercostal 

 space close to the Sternum, i. e. the point where the Aorta lies close to the 

 Anterior Thoracic Wall. 



The Mitral Valvular sound is listened for at the apex of the Heart. 



