ccx 



HAIRS. 



internal layer (hyaline coat, Kolliker) is a transparent homogeneous mem- 

 brane, marked transversely on its inner surface with some raised lines, and 

 not reaching so high as the mouth of the follicle ; it corresponds with the 



Fig. CXIV. 



Fig. CXV. 



Fig. CXIV. MEDIUM-SIZED HAIR 

 IN ITS FOLLICLE, MAGNIFIED 

 50 DIAMETERS (from Kolliker). 



a, stem cut short ; &, root ; c, 

 knob ; d, hair cuticle ; e, internal, 

 and /, external root-sheath ; g, h, 

 dermic coat of follicle ; i, papilla ; 

 Jc k, ducts of sebaceous glands ; I, 

 corium ; m, mucous layer, and n, 

 horny layer of epidermis ; o, upper 

 limit of internal root-sbeath (from 

 Kolliker). 



Fig. CXV. MAGNIFIED VIEW OF THE ROOT OF 

 A HAIR (after Koblrauscb). 



a, stem or sbaffc of hair cut across ; &, inner, 

 and c, outer layer of tbe epidermic lining of the 

 hair-follicle, called also the inner and outer root- 

 sheath ; d, dermic or external coat of the hair- 

 follicle, shown in part ; e, imbricated scales about 

 to form a cortical layer on the surface of the hair. 

 The adjacent cuticle of the root-sheath is not repre- 

 sented, and the papilla is hidden in the lower 

 part of the knob where that is represented lighter. 



membrana propria or basement membrane 

 of analogous structures. Between the two 

 is a layer extending from the bottom of 

 the follicle as high as the entrance of the 

 sebaceous glands, composed of an indis- 

 tinctly fibrous matrix, tearing transversely, 

 and of transversely disposed fusiform 

 connective tissue corpuscles, with oblong 

 nuclei. This layer, which seems to be a 

 form of connective tissue, receives capillary blood-vessels, but without as 

 yet recognized nerves. The epidermic lining adheres closely to the root 

 of the hair, and commonly separates, in great part, from the follicle and 

 abides by the hair when the latter is pulled out ; hence it is sometimes 

 named the " root-sheath." It consists of an outer, softer, and more opaque 

 stratum (fig. cxv. , c, c) next the dermic coat of the follicle, and an internal 

 more transparent layer (6, b) next the hair. The former, named also the 

 outer root-sheath, and by much the thicker of the two, corresponds with the 



