422 



INNEKVATION. 



[CHAP. xiv. 



Fig. 28. 



The sweat-glands exist under almost every part of the cutaneous 

 surface. They lie in small pits (fig. 83, d) on the deep aspect of 

 the cutis ; or, if large, entirely in the subcutaneous fascia. As before 

 mentioned, their orifices are discernible in the middle of the cross 

 grooves that intersect the ridges of papillae on the hands and feet. 

 Here their arrangement is necessarily regular, and their size is about 

 that of a pin's head. But in other parts they are irregularly scat- 

 tered, though in general in pretty equal numbers over areas of the 

 same dimensions. In certain situations, however, they are very 

 large ; and, as might be expected, we find their size and number 

 in different districts of the skin to correspond with the amount of 



perspiration afforded by each. Thus, they 

 are nowhere so remarkable, or so easily 

 examined, as in the axilla, over a space 

 precisely defined by the growth of the hair 



b f & in the adult. They here form a layer, 



which, towards the middle, is often an 



Vertical section of the skin and ei g hth f an mCn thlck ' but thiimer tQ - 



wards the ed s e - Jt is of a reddish colour > 



Li? 6 ff rStoSSirfr S and mammellated by the individual glands 



Magnified one and a half diam. which COmpOSC it. Some of these are as 



large as the labial glands, but most of them are somewhat smaller. 



They are soft, and more or less 

 flattened by lateral apposition 

 with one another, They lie in 

 an atmosphere of delicate areo- 

 lar tissue, and are covered and 

 permeated with a network of 

 capillary blood-vessels. 



The sweat-glands can be 

 shown, wherever they exist, by 

 dissecting a piece of fresh in- 

 tegument on its deep surface. 

 They are distinguishable from 

 the pellets of fat, with which 

 they have doubtlessbeenrepeat- 

 edly confounded, by their pink 



Sweat-gland and the commencement of its duct : J 



a. Venous radicles on the wall of the cell in which the colour andsemi-trailSparent tCX- 

 gland rests. This vein anastomoses with others in the 



vicinity, b. Capillaries of the gland separately repre- ture. Where the areolar trame- 

 sented, arising from their arteries, which also anasto- . . . 



mose. The blood-vessels are all situated on the out- WOrkoi the CUtlS IS densely inter- 

 side or deep surface of the tube, in contact with the . . 

 basement membrane. Magnified 35 diameters. WOVCn, they are leSS readily CllS- 



cerned, but injection of the blood-vessels makes their detection easy. 



Fig. 90. 



