128 



THE ANATOMY OF THE HORSE. 



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-ventriadar opening. 



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

 introduced througli 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- 



Fic 10. 



Heart seen from the right side, the right Auricle and Ventricle having 

 BEEN opened (Leiseving and MilUcr). 



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

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

 coronary vein ; a". Mouth of the coronary venous sinus ; tl. Fossa ovalis ; 7. Tubercle of Lower ; 

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

 and posterior aorta ; 12. Left auricle ; IS. Pulmonary veins ; 14, Right coronary artery ; 14'. Right 

 coronary artery and vein in the right ventricular furrow ; 16. 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 



