12 



QUATERCENTENARY STUDIES IN PATHOLOGY 



of the endocardium. The upper or pulmonary orifice is guarded by two 

 valves partially adherent. The orifice is so narrow that very little blood 

 could have entered the pulmonary artery from the right ventricle. The 

 aorta opens directly from the right ventricle, and the septal bands 



A 



B 



Figure 6, heart of a girl aged two years. A represents the heart unopened ; B the right 

 ventricle laid open. (The specimen was given to me by Dr. J. A. Milne.) 

 (i) Pulmonary artery. 

 (2) Aorta. 



Position of infundibulum or bulbus. 



Lower orifice of infundibulum or bulbus. 



Body of right ventricle. (Above 5 in figure B is seen the interventricular foramen.) 



Tricuspid valve. 



Right auricle. 



Left ventricle. 



Left auricle. 



(66) 



(3) 

 (4) 

 (5) 

 (6) 

 (7) 

 (8) 

 (9) 



