110 



THE ESSENTIALS OF HISTOLOGY 



FIG. 132. PIECE OF HUMAN 

 HAIR. (Magnified.) 



A, seen from the surface; B, in 

 optical section, c, cuticle ; /; 

 fibrous substance; m, medulla, 

 the air having been expelled by 



Fio. 134. SECTION OF HAIR- 

 FOLLICLE. 



1, dermic coat of follicle; 2, epi- 

 dermic coat or root-sheath ; a, 

 outer layer of dermic coat, with 

 blood-vessels, 6, b, cut across ; c, 

 middle layer ; d, inner or hyaline 

 layer ; e, outer root-sheath ; /, g, 

 inner root-sheath ; h, cuticle of 

 root-sheath ; /, hair. 



FIG. 133. HAIR-FOLLICLE IN LONGITUDINAL, 

 SECTION. 



a, mouth of follicle ; b, neck ; c, bulb ; d, e, dermic 

 coat ; /, outer root-sheath ; g, inner root-sheath ; 

 h, hair ; k, its medulla ; I, hair-knob ; m, adipose 

 tissue ; n, hair-muscle ; 0, papilla of skin ; p, 

 papilla of hair ; s, rete nmcosum, continuous with, 

 outer root-sheath ; ep, horny layer ; t, sebaceous 

 gland. 



