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 hody 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 

 from 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, pericardium; C, anterior vena 

 cava ; D, posterior vena cava; E, anterior aorta; F, posterior aorta. 



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

 semi lunar 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 the blood, and waste materials which the 

 lymph receives from the tissues are poured into the blood through 

 the thoracic duct and the right lymphatic duct. 



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