HAIR 



393 



layer, also free from elastic tissue, is sometimes longitudinally fibrous, and 

 sometimes homogeneous. It forms the outer stratum of the hyaline (or 

 vitreous) membrane, and is continuous below with the thin but distinct 



Hair cuticle. Cortical substance. 



Shaft of the hair. 



Longitudinal fiber 

 layer. 



Circular fiber layer. 



Outer layer of the hya- 

 line membrane. 



Inner layer of the hya- 

 line membrane. 



Outer epithelial 

 sheath. 



Henle's layer 

 Huxley's layer 



Cuticle of the inner 

 sheath. 



Papilla. 



I I Medullary substance. 



FIG. 39Q. LONGITUDINAL SECTION OF THE LOWEST PART OF THE ROOT OF A HAIR. (From a section of 



the human scalp.) X 200. 

 The kerato-hyalin granules are colored red. 



