SEBACEOUS GLANDS. 



321 



arrangement of the glands of the general surface, they secrete essentially the 

 same fluid, and their anatomical differences consist simply in a multiplication 

 of follicles. 



The differences in the size of the sebaceous glands bear a certain relation 



to the size of the hairs with which they are connected ; and as a rule, the 



B n . D 



FIG. 99. Sebaceous glands (Sappey). 



A, a gland in its most rudimentary form : 1, rudimentary hair-follicle ; 2, downy hair ; 3, simple seba- 



ceous follicle. 



B, a gland more developed : 1, hair-follicle ; 2, simple sebaceous follicle. 



C, a gland with two follicles : 1, hair-follicle ; 2, simple follicle : 3, follicle imperfectly divided. 



D, a compound gland : 1, hair-follicle ; 2, lobule with three follicles ; 3, lobule with four follicles. 



E, a gland with four lobules : 1, hair-follicle ; 2, 2, first lobule : 3, second lobule ; 4, 4, third lobule ; 5, 



fourth lobule ; 6, excretory duct with a hair passing through it. 



F, a gland with four lobules : 1, hair-follicle ; 2, 2, first lobule ; 3, second lobule ; 4, third lobule ; 5, fourth 



lobule ; 6, excretory duct. 



largest glands are connected with the small, downy hairs. These distinctions 

 in size are so marked, that the glands may be divided into two classes ; viz., 

 those connected with the long hairs of the head, face, chest, axilla and geni- 

 tal organs and with the coarse, short hairs, and those connected with the 

 fine, downy hairs. 



The glands connected with the larger hair-follicles are of the simple race- 

 mose variety and are -^ to ^ of an inch (0-21 to 0-64 mm.) in diameter. 

 Two to five of these glands are generally found arranged around each hair- 

 follicle. They discharge their secretion at about the junction of the upper 



