ORGANS OF THE BODY. 



551 



the tactile corpuscles. These observations have been since confirmed by 

 the discovery of the presence in this organ of end bulbs, as they are 

 called, and other mulberry-shaped terminal structures allied to them, the 

 genital bodies (Wollustkorperchen of Krause, Finger}, Pacinian cor- 

 puscles have also been found in the labia majora, where they merge into 

 the nymphse, and in the prseputium clitoridis (Schweigger-Seidel). 



281. 



The mammary glands, which only attain their full development in the 

 female body and corresponding secretory power, belong to the great group 

 of racemose organs, as 

 has been already re- 

 marked (p. 358). They 

 are peculiar, however, 

 in that each organ does 

 not empty itself event- 

 ually into one single ex- 

 cretory duct. In either 

 breast the milk is poured 

 out by from eighteen to 

 twenty canals or galac- 

 topherous duds as they 

 are called, each of which 

 belongs to one of the 

 primary lobes, or, better 

 expressed, glands. Hav- 

 ing already frequently 

 referred to the nature 

 of racemose glands, we 

 need only, remark here, 

 that in this particular 

 instance the end vesicles 

 (formed of a homoge- 

 neous membrana pro- 

 pria) are more sharply 

 defined one from the 

 other, also that their 

 form is spherical or pear- 

 shaped, each having a 

 diameter of between 



0'1128 and 01872 mm. Fig. 539. The mammary gland; for the most part after Langer. 

 (fitr 539 1 2 O\ 1. A lobule, from the interior of the gland of a pregnant woman. 



Their membrana propria 

 presents, as in other 

 allied glandular organs, a network of flattened stellate cells (Langer}. Both 

 the lobules and lobes are enveloped in fatty connective-tissue, which gives 

 to the breast its usual smooth rounded appearance. The former are 

 also invested in the characteristic vascular networks of racemose glands. 

 Of the lymphatics of the organ but little is known at present, and the 

 nerves of the interior have but rarely been the objects of research. The 

 influence of the latter on the process of secretion has likewise never been 

 demonstrated experimentally. The interior of the vesicles is lined finally 

 36 



2. a, vesicle ; 6, gland-cells. 3. Ducts from an infant. 4. Galac- 

 tophorous duct from a boy 9 years old. 5. The same from a girl 

 of 15. 6. The same from a grown man. 



