THE HAIRS. 



327 



complex, however, are cuboidal or low columnar and form an uninterrupted 

 tract over the papilla, continuous with the outermost cells of the outer root- 

 sheath. It is from the proliferation of these deepest cells that the formative 

 material, or matrix, is provided to meet the requirements of growth and 



* 4 V^Pfe 



c 



Cuticle of 





SWAA/ 



?foi' | fe- Cells forming 

 ! *. J , / : medulla 



Cells forming 

 conex 



Hair-papilla 



Blood-vessel 



FIG. 371. Longitudinal section through deepest part of hair-follicle. X 285. 



replacement of the hairs. Of the three parts of the hair, the medulla is 

 produced by the cells overlying the summit of the papilla, while those con- 

 verted into the cortical substance, cuticle and inner root-sheath occupy the 

 sides of the papilla and deepest part of the follicle. 



With few exceptions, the hair follicles are associated with two or more 

 sebaceous glands, rarely with only one, the ducts of which open into the 



