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STUDIKS IN ADVANCED PHYSIOLOGY. 



veins) and from it (the arteries). Into the right auricle 

 open several large veins the descending vena cava, the as- 

 cending vena cava, the azygos vein, and several small 



Fig. 71. VlRW OF HEART AND GREAT VESSELS FROM BEFORE. (Quain.) 



3, pulmonary artery cut off; 1, arch'of aorta; 2, left ventricle; 4, aorta; 5, right auricle; 

 6, left auricle; 7, innominate veins joining to form the descending vena cava; 8, ascending 

 vena cava; 9, hepatic veins; + + left coronary artery. 



coronary veins. The right ventricle is connected with the 

 large pulmonary artery leading to the lungs. The left 

 auricle has opening into it, usually three or four pulmonary 

 veins, while the left ventricle communicates with the large 

 aorta, which through its many branches carries the blood 

 over the entire system. From the aorta close to the heart, 

 two arteries arise which lead through the substance of the 

 heart itself and nourish it. These are the coronary arter- 

 ies. A conspicuous branch of these coronary arteries and 

 the corresponding returning coronary veins, may be easily 



