THE HEART 



111 



and inward. Between the two caval openings a 

 projection, the tubercle of Lower. The opening of the 

 coronary sinus, between the inferior cava and the 

 auriculoventricular opening, and protected by the fold 

 of endocardium forming the coronary valve. Numer- 



FIG. 72 



Foramina 

 Thcbcsii 



Tubercle 

 of Loi. 



JlriMc ]inKfd through 

 right aurirttloiriitHcular opening. 



The right auricle and ventricle laid open, the anterior walls of both being 

 removed. (Gray.) 



ous small openings (foramina Thebesii) of the small 

 veins of the heart. The auriculoventricular opening, 

 between the auricle and ventricle. The Eustachian 

 valve, between the front of the inferior vena cava 

 12 



