128 



THE ANATOMY OF THE HOI WE. 



contracts the blood is passed into the ventricle of the same side by a 

 large aperture of communication between the two cavities- — the right 

 auriculo-ventricular opening. 



Directions. — The fore and middle fingers of the left hand should be 

 introduced through the auriculo-ventricular opening, so as to grasp, 

 between the fingers and thumb, the wall of the right ventricle close to 

 the angle of junction between the right ventricular and the auriculo- 



Fig. 10. 



rii;uiT sees from the right side, the right" Auricle and Ventricle having 

 been opened (Leisering and Miiller). 



A. Right auricle; B. Right ventricle ; C. Unopened left ventricle ; 1. Right auricular appendix ; 



2 Vnterior vena cava; 3. Vena azygos ; 4. Posterior vena cava; 5. Left coronary vein ; 5'. Right 

 coronary vein ; 5". Mouth of the coronary venous sinus; 6. Fossa ovalis; 7. Tubercle of Lower; 

 - Musculi papillares ; 9. Tricuspid valve ; 9'. Chordae tendinese ; 10. Moderator band ; 11. Anterior 

 and posterior aorta ;»12. Left auricle; 13. Pulmonary veins ; 14. Right coronary artery ; 14'. Right 

 coronary artery and vein in the right ventricular furrow ; 13. Position of the os cordis when it is 

 present. 



ventricular groove. The scalpel should then with the right hand be 

 passed through the wall of the ventricle at that point, and carried 

 downwards in front of the right ventricular furrow ; and, following that 



