SUDORIFEROUS GLANDS 



SUDORIFEROUS OR SWEAT-GLANDS 



97 



A sweat-gland (Figs. 67 and 70) consists of a tube or duct 

 which, from the opening upon the surface, passes in a spiral 

 course through the several layers of the skin to the deeper part 

 of the corium, where it becomes coiled in a bunch, as at D, 

 Fig. 70. The coiled or glandular part of the tube is surrounded 

 by a net -work of capillaries. At B the tube is seen in transverse 

 section. The gland -tube, D, is provided with a wall of connec- 

 tive tissue and smooth or involuntary muscle, lined with conical 



FIG. 70. SUDORIFEROUS TUBULAR GLAND. 



A. Diagrammatic sweat-gland. C. Its duct. D. Coiled, glandular part. 



B. The same, showing a transverse section of both parts (X 400). C'. The duct lined 

 with several layers of cells. D'. The coiled glandular part lined with columnar cells in a 

 single layer, resting on a basement membrane. 



cells. The duct, C, is lined with granular epithelium covered 

 with a thin cuticular membrane. Near the surface of the epider- 

 mis the lining cells disappear. 



Krause estimated the number of sweat-glands at over two 

 million. 



