282 THE MAMMARY GLANDS, BY C. LANGEK. 



The stroma of the developing gland consists of tendinous 

 fasciculi of connective tissue with scattered fusiform corpuscles 

 that are so closely interwoven with each other as to form an 

 indivisible, dense, caoutchouc-like mass, with numerous canals 

 for the passage of the ducts and larger bloodvessels. Capillaries 

 arranged in the form of interwoven plexuses everywhere 

 traverse the compact tissue, but principally run towards the 



Fig. 207. 



Fig. 207. Acini of the mammary gland of a young Woman, with 

 greatly swollen haloes. Hartnack's system No. 8. 



ducts. The blunt extremities of the still growing ducts 

 become surrounded by fasciculi of vessels, which ramify on the 

 surface, and, closely applied to each, accompany it for some 

 distance in its course. In these cases the vessels form fibre- 

 like appendages that obviously prefigure the direction of the 

 subsequent growth of the ducts ; the lobules already present, 

 on the other hand, are surrounded and traversed by a plexus of 

 capillaries. 



Many of the capillaries of the stroma are abundantly 

 supplied with nuclei ; from others, again, very fine processes 

 are given off that are scarcely pervious, and clearly represent 

 capillaries in course of development. I have also been able to 

 distinguish small nerves composed of two or three medullated 

 fibres, and I have seen fibrils pursuing an isolated course, and 

 dividing dichotomously. In, the interior of the vascular 

 fasciculi given off from the obtuse ends of the ducts I have 



