326 MICROSCOPIC ANATOMY OF THE ORGANS. 



give origin to the true hair ; while the cells lying around this 

 form the inner root sheath. The more peripheral cells go to 

 make up the outer root sheath (Fig. 248). 



FIG. 248. 



Epifomi* \T 



Outer- 



Rudiment of 



Root sheath -\ gland of 



/ hair follicle 



Inner- 



Ilnir-- 



Insertion of ni. 



arrector pili 



Hair follicle- 



- Hun- papilla 



From a vertical section through the scalp of a human embryo of the sixth month. X 150. 



The growth of the hair and the inner root sheath takes 

 place from the region of the papilla to the outer surface of the 

 skin ; while the outer root sheath grows from the hair follicle 

 toward the axis of the hair. The mother cells for the outer 

 root sheath are the cells of the outermost layer of this sheath ; 

 while the matrix of the hair and inner root sheath is made up 

 of the cells at the lower end of the hair bulb immediately 

 bordering on the hair papilla. These matrix cells are the same 

 at this stage for the various layers of the hair and inner root 



