MAMMARY GLANDS SECRETION OF MILK. 



541 



[Fig. 159. ] 



The Mammary Gland after the removal of the 

 skin, as taken from the subject three days after 

 delivery; 1, the surface of the chest j 2, subcuta- 

 neous fat ; 3, the skin covering the gland ; 4, cir- 

 cumference of the gland ; 5, its lobules separated 

 by fat; 6, the lactiferous ducts converging to unite 

 in the nipple; 7, the nipple slightly raised and 

 showing the openings of the tubes at its extremity.] 



A vertical section of the Mammary Gland, 

 showing its thickness and the origins of the lacti- 

 ferous ducts ; 1, 2, 3, its pectoral surface ; 4, section 

 of the skin on the surface of the gland ; 5, the thin 

 skin covering the nipple ; 6, the lobules and lobes 

 composing the gland ; 7, the lactiferous tubes com- 

 ing from the lobules ; 8, the same tubes collected 

 in the nipple.] 



Fig. 160. 



Distribution of the milk-ducts in the mamma of the human female, during lactation; the ducts injected 

 with wax. (After Sir A. Cooper.) 



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