THE CIRCULATORY SYSTEM 



155 



entering from above, and the inferior vena cava, entering 

 from below. These two veins bring to the heart the blood 

 from all parts of the body, except from the lungs and the 

 heart itself. Close beside the inferior vena cava the coro- 

 nary vein opens into the right auricle. This brings to 



Right Pulmonary Artery 



Left Pulmonary 

 Artery" 



Left Pulmonary 



Left Auricle. 



fij?/ /Supertor* 

 Vena Cava 



Right Pulmonary 

 .--'%'' Veins 



iferior Vena Cava 



Fig. 88. Heart seen from behind. 

 Coronary arteries and veins are injected, arteries red, veins blue. 



the auricle the blood from the capillaries of the heart 

 itself, which like all other organs of the body is supplied 

 with blood vessels and lymphatics for its own nutrition. 



214. The Left Auricle lies at the left and back of the 

 upper part of the heart. Its walls are slightly thicker 

 than those of the right auricle. It receives four pulmo- 

 nary veins, two from each lung. The openings have no 

 valves. 



