ON THE DEVELOPMENT OF THE SUPEEFICIAL 

 LYMPHATICS IN THE 8KIN OF THE PIG/ 



BY 



FLORENCE R. SARIN, M. D., 

 Associate in Anatomy, Johns Hopkins University. 



With 7 Text Figures. 



In a previous paper ^ has been given an aecoimt of the origin of the 

 lymphatic ducts from the veins by the budding off of blind sacs from 

 their endothelial lining. The growth of these blind ducts toward the 

 skin and their gradual spreading over the surface of the body was de- 

 scribed briefly and illustrated by a composite picture. In the present 

 communication the spreading of the superficial lymphatics will be de- 

 scribed more in detail as well as the growth of these ducts in the differ- 

 ent layers of the skin. 



The lymph ducts bud off from the veins in four places; two in the 

 neck, at the junction of the jugular and the subclavian veins; and two 

 in the posterior part of the bod}', from the vein Avhich enters the Wolffian 

 body and which is formed by the union of the femoral and sciatic veins. 

 As the Wolffian body dissappears, and its venous system is supplanted 

 by the vena cava, this lower connection of the lymphatics with the veins 

 is given up. From these four points of origin the lymphatics grow 

 first along the veins toward the skin, and secondly along the aorta and 

 its branches to the various organs. The superficial lymphatics to the 

 skin follow the veins, the jugular in the neck and the femoral and its 

 branches in the lower part of the body. The deep lymphatics follow 

 the arteries ; primarily the aorta making the thoracic duct, and secondar- 

 ily the branches of the aorta. 



' This paper together with one on the Development of the Lymphatic Sys- 

 tem and a part of a paper on the Development of Lymph Glands, soon to appear 

 in this Journal, was accepted by The Association for Maintaining the Amer- 

 ican Woman's Table in the Zoological Station at Naples and for Promoting 

 Scientific Research by Women. 



- On the Origin of the Lymphatic System from the Veins and the Develop- 

 ment of the Lymph Hearts and Thoracic Duct in the Pig. The American 



JOTJENAL OF ANATOMY, Vol. I, No. 3. 



American .Journal of Anatomy. — Vol. III. 



