CHAPTER XIV 



LYMPH F< »i;m a l [( >N AND < IK< i I \ I !• 



GENERAL CONSIDERATIONS 



Lymphatics are modified veins. Th< 

 onic life aa buds of endothelium, which arc t • 

 embryo in the sixth week of development. The 

 curs from the internal jugular vein, and the endi 

 come hollow and join together, forming tir>t a pl< 

 a Bac, from which again lymphatic \ 

 out in invade the akin <>t" the head, neck, thoi 

 the deep Btructu the head. The - ultim 



groups of lymph glands. At a later similar : 



certain <>i* tin 1 abdominal veins, forming a retro] 

 grow out tin- lymphatics of tin- abdominal ami, • 

 thr thoracic viscera. A similar pair i 

 veins supplying thr lymphatics for tin- Bkin of t! 

 walls. Tin- retroperitoneal and iliac inn b< 



the jugular sac by means of the thoracic duct l 

 no \al\rs in tin- lymphatic i thai the wl 



jected either from the thoracic duel or from I 

 thai tin- superficial and deep lymphatics are pi 

 of vessels. 



Anatomists have succeeded in tracin 

 many parts of the body. This knowled 



connection with the spread of infectioi bun- 



danl in the skin, the intestine, and 

 from the muscle bundles, from the hepatic lobuli 

 the connecth e t issue between 1 

 ami from the central u< 



The l\ mphatics ha\ e thi 

 to absorb Bubstanci I 



show that this absorption mi 

 into the peritoneal <-a\ ity, tl 

 blood vess< -; i lymphatic* 



Btance inject* -1 True boIu! 



