396 



THE ORGANS 



In the deeper portion of the root, some Httle distance above the 

 bulb, all the layers of the hair and its follicle can be distinctly seen. 

 The differentiation of the layers becomes less marked as one passes 

 in either direction. At about the level of the entrance of the ducts 

 of the sebaceous glands (seep. 397) the inner root sheath disappears, 

 and the outer root sheath passes over into the stratum germinativum 

 of the skin, while between the outer root sheath (now stratum germi- 





In 



!t||' 





'f,i.'l 







! ?%^ 





H" 





b 

 c 

 d 



Fig. 280.— Longitudinal Section of Lower End of Root of Hair, including Papilla. 

 (Kolliker.) a, Root of hair; b, cuticle of hair; c, cuticle of root sheath; </, Huxley's layer 

 of inner root sheath; c, Henle's layer of inner root sheath;/, outer root sheath; g, vitreous 

 membrane;^, connective-tissue follicle; k, bulb of hair; p, papilla. 



nativum) and the hair are interposed the outer layers of the skin, 

 stratum granulosum and stratum lucidum when present, and stra- 

 tum corneum. All of these are continuous with the same layers of the 

 skin. In the region of the bulb the outer root sheath first becomes 

 thinner, then disappears, while the layers of the inner root sheath 

 retain their identity until the neck of the papilla is reached, at which 

 point the different layers coalesce. 



