STRUCTURE OF THE HAIR. 



243 



Numerous capillaries proceeding from the bloodvessels dis- 

 tributed to the external sheath of the follicle penetrate the 



Fig. 201. 



Fig. 201. Hair of the 

 beard. 6, Neck of the 

 hair follicle ; a, excretory 

 duct ; c, dilatation of the 

 hair follicle ; d, external 

 sheath of the hair follicle ; 

 m, fat cells ; e, internal 

 sheath of the hair follicle ; 

 p, papilla ; /, external root- 

 sheath ; g, internal root- 

 sheath ; h, cortical sub- 

 stance ; k, medullary sub- 

 stance of the hair shaft ; 

 I, root of the hair ; n, ar- 

 rector pili ; t, sebaceous 

 gland ; o, papillae of the 

 skin ; s, mucous layer (rete 

 mucosum) ; ep, epidermis, 

 which is continued into 

 the excretory duct of the 

 hair follicle. 



