40 



ANATOMY. 



Its opening in the vein is protected by a valve in order that blood 

 may not get into the duct. This duct drains all the body except 

 the right side of the face, right side of head and neck, right shoul- 

 der and right front limb. 



The right lymphatic duct is a very short vessel into which 

 empty all the vessels which drain these latter regions. 



Lymph glands. — The lymph glands serve in part to remove 

 fronj the lymph disease germs and other harmful bodies. Their 

 function is something like that of a filter. 



FIG. 20. CIRCULATION. DIAGRAMMATIC. 



1. Heart and Blood Vessels. A, Heart: B, pei icardium ; C, anterior vena 

 cava; D, posterior vena cava: E, anterjoi- aorta: F, posterior aorta. 



2. The Circulation in Diagram. A, A, Auricle-ventricle valves; B, B, 

 .semilunar valves. 



Function. — The lymph fluid distributes nourishment by os- 

 mosis directly to the body tissues, and removes waste materials 

 by the same process. The nutritious materials are as a rule taken 

 into the lymph from tlu- blood, and waste materials which the 

 lymph receives from the tissues arc poured into the blood through 

 the thoracic duct and the right lymphatic duct. 



