CH. XVIII.] 



THE CAPILLARIES. 



221 



interspaces have a roundish form is the most common, and 

 prevails in those parts in which the capillary network is most 

 dense, such as the lungs (fig. 224), most glands and mucous 

 membranes, and the cutis. The meshes of this kind of network 

 are not quite circular but more or less angular, sometimes pre- 

 senting a nearly regular quadrangular or polygonal form, but 



Lymphatics of head 

 and neck, right. 



Bight internal jugular 



vein. 

 Right subclavian vein. 



Lymphatics of right 

 arm. 



Reoepta-mlum chyli. 



Lymphatif s of lower 

 extremities. 



Lymphatics of head 

 and neck, left. 



Thoracic duct. 



Left subclavian vein.' 



Thoracic duct. 



Lactecal. 



Lymphatic* of lower 

 extremities. 



Fig. 226. Diagram of the principal groups of Lymphatic vessels. (From Quain 



being more frequently irregular. The capillary network with 

 elongated meshes is observed in parts in which the vessels are 

 arranged among bundles of fine tubes or fibres, as in muscles and 

 nerves. In such parts, the meshes form parallelograms (fig. 225), 

 the short sides of which may be from three to eight or ten times 

 less than the long ones ; the long sides are more or less parallel 

 to the long axis of the fibres. 



