ACCESSOEY ORGANS OF THE SKIN. 



487 



Fig. 325. 



hair-sacs ; and hence are sometimes termed the glands of the hair- 

 sacs. They in fact occur, of the hairless parts, only on the labia 

 minora, and the glans penis and clitoridis, and the prepuce of both 

 the male and the female. The opening of the gland is sometimes 

 common with that of the hair-sacs', sometimes it terminates in the 

 latter, and sometimes the hair-sac is smallest, and the hairs come 

 out through the glandular opening itself. (Fig. 324, B.) Generally, 

 the small hair-sacs have the larger glands, and vice versa. The hairs 

 of the scalp have the smallest, y^ 

 to syJiy of an inch in diameter, and 

 these are simple follicles lodged in 

 the superficial portion of the corium. 

 The largest of all exist on the mons 

 veneris, the labia majora, and the 

 scrotum, where they are compound, 

 and found in the deepest portions of 

 the corium. Frequently two or more 

 (even five) glands are connected with 

 a single hair (Fig. 135) ; there being 

 generally two in the scalp. The 

 glands upon the nose (also the ante- 

 rior half of the penis, and the areola), 

 often attain to a colossal size and 

 peculiar forms. (Fig. 325.) 



The sebaceous glands on the glans 

 penis and the inner lamella of the 

 prepuce, called Tyson's glands, some- 

 times occur in very small number, 

 and sometimes in hundreds. Gene- 

 rally, ten to fifty are found on the 



, A large racemose sebaceous gland from 



prepuce, and mostly racemose ; while the nose with a nttie hair- 8ac opening into 

 on the o-lans they may be totally ab- u> The letters (a ~ f} as in Fi - aaiMag- 



. J J nified 50 diameters. (KoUiker.) 



sent, or may exist in its anterior sur- 

 face in great numbers (even to one hundred) being here more 

 simple. 



The Meibornian glands in the eyelids must also be regarded as a 

 larger kind of sebaceous gland. (Fig. 136.) 



In their minute structure the sebaceous glands consist of 1, an 

 external delicate layer of collagenous tissue (or basement-mem- 

 brane KoUiker), continued from the hair-sac, or the corium where 



