THE LYMPHATIC SYSTEM 



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in this way being mainly the lymph glands, or lymph nodes. 

 Anatomically, the system may be regarded as comprising super- 

 ficial and deep portions, the superficial nodes occurring under the 

 skin either singly, as in the head and neck, or more or less grouped, 

 as in the axillary and inguinal regions, their precise number and 



Fig. 67. Some of the lymph vessels and nodes of the anterior part of 

 the rabbit, according to Jossifow (redrawn): ao, aorta; da, deep axillary 

 lymph node; do, deep cervical lymph node; dt, thoracic duct; h, lymph vessels 

 of heart; 1, lymph vessels of lungs; 11, lymph vessels from lips; m, mediastinal 

 lymph nodes; sa, superficial axillary lymph nodes; sc, superficial cervical 

 lymph nodes; sm, submaxillary lymph nodes; tj, jugular trunk; ts, subclavian 

 trunk; vj, external jugular vein. 



arrangement being somewhat variable. As deep structures they 

 are conspicuous in the intestinal mesenteries and in the walls of the 

 digestive tube, occurring in the latter chiefly as continuous masses 

 of lymph follicles, as, for example, in the walls of the sacculus 

 rotundus, the vermiform process, or the tonsil; or, again, as aggre- 

 gated lymph follicles (Peyer's patches) at various points in the 

 wall of the small intestine. • . 



