110 



THE ESSENTIALS OF HISTOLOGY 



Flii. 132. PlECK OF HUMAN 



HAIR. (Magnified.) 



A, seen from the surface; B, in 

 optical section, c, cuticle ; /, 

 fibrous substance ; , medulla, 

 the air having been expelled by 

 Canada balsam. 



Fia. 134. SECTION OF HAIK- 

 FOLLICLK. 



1, rlermic coat of follicle ; 2, epi- 

 dermic coat or root-sheath ; , 

 outer layer of dermic coat, with 

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

 middle layer ; d, inner or hyaline 

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

 inner root-sheath.; /(, cuticle of 

 root-sheath ; I, hair. 



FIG. 133. HAIR-FOLLICLE IN LONGITUDINAL 



SECTION. 



a, mouth of follicle ; 6, neck ; c, bulb ; d, e, dermic 

 coat ; /, outer root-sheath ; <j, inner root-sheath ; 

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

 tissue ; ., hair-muscle ; o, papilla of skin ; />, 

 papilla of hair ; ,?, rete nuicosum, continuous with 

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

 gland. 



