232 NORMAL HISTOLOGY. 



relation of the erector pilse muscle to the sebaceous 

 gland is probably not without significance in connec- 

 tion with the discharge of the secretion of the latter. 



SWEAT-GLANDS. 



The sweat-glands, which are found in the skin of 

 almost all parts of the body, although much more 

 abundant in some than in others, are tubular glands, 

 the tube consisting of a membrana propria, lined 

 throughout with polyhedral and cuboidal epithelium. 

 Its lower extremity, coiled into a ball, and held to- 

 gether by loose connective tissue, lies sometimes in 

 the corium, sometimes in the subcutaneous tissue. 

 The upper portion of the tube, which serves as the 

 excretory duct, passes to the surface of the skin, 

 often taking a wavy course through the corium. It 

 pierces the epidermis between two papillae, and here 

 the walls of the duct cease, and it is bordered by 

 epidermis-cells alone. If the epidermis-layer is thick, 

 as in the palm, etc., the course of the duct through 

 it is a remarkably winding one. An abundant capil- 

 lary net-work lies in the loose connective tissue of 

 the gland-coil. 



NERVES. 



The nerves of the skin ramify in the subcutaneous 

 tissue, and a certain number of them terminate here 

 in the so-called Pacinian bodies ; others pass into 

 the corium, where they form plexuses, varying in 



