30 GENERAL STRUCTURE OF THE BODY. 



tends throughout the body and consists of a system of 

 channels, spaces, and glands very closely related to the 

 circulatory system and containing a fluid called lymph. 

 There are three principal parts to the system: 1. the 

 lymph spaces, which are open spaces, with no definite 

 walls, in the connective-tissue framework of the body, 

 more frequent near arteries and veins and especially so 



FIG. 7. Diagram showing the course of the main trunks of the absorbent 

 system: the lymphatics of lower extremities (D) meet the lacteals of the intestines 

 (LAC) at the receptaculum chyli (R.C.), where the thoracic duct begins. The 

 superficial vessels are shown in the diagram on the right arm and leg (s), and the 

 deeper ones on the left arm (D). The glands are here and there shown in groups. 

 The small right duct opens into the veins on the right side. The thoracic duct 

 opens into the union of the great veins of the left side of the neck (T). (Yeo.) 



among the capillaries; 2. the lymph capillaries or small 

 vessels which connect the lymph spaces; and 3. the 

 lymphatic vessels, of which there is a deep and a super- 

 ficial set, the latter accompanying the superficial veins 

 on the surface of the body, the former accompanying 

 the deep blood-vessels. 



The lymph spaces are generally small, though there 



