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 espelled'by 

 Canada balsam. 



Fia. 134. SECTION OF HAIR- 

 FOLLICLE. 



I, dermic coat of follicle ; 2, epi- 

 dermic coat or root-sheath ; a, 

 outer layer of dermic coat, with 

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

 middle layer ; d, inner or hyaline 

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

 inner root-sheath ; ft, cuticle of 

 root-sheath ; I, hair. 





FIG. 133. HAIR-FOLLICLE IN LONGITUDINAL 



SECTION. 



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

 coat ; /, out^r root-sheath ; ci, inner root-sheath ; 

 h, hair ; I; its medulla ; I, hair-knob : m. adipose 

 tissue ; n, hair-muscle : o, papilla of skin ; p, 

 papilla of hair : s, rete mucosum, continuous with 

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

 gland. 



