THE HAIK 



217 



rations. The layer is seldom more than one cell deep. It is 

 homologous with the stratum lucidum of the epidermis. 



Outer Root Sheath. The outer root sheath is continuous with 

 the stratum mucosum of the epidermis and therefore contains 



b 



FIG. 188. TRANSECTION OF A HAIR NEAR THE MIDDLE OF THE ROOT SHEATH. 

 o, dermal root sheath ; &, outer margin of the epidermal root sheath the light space 

 is the glassy membrane, the polyhedral cells form the outer root sheath ; c, Henle's layer 

 of the inner root sheath ; d, Huxley's layer; , cuticle of the root sheath ;/, cuticle of 

 tin- hair; <j, cortex of the hair shaft. Highly magnified. (After Kolliker.) 



similar cell types. The granular layer, as in the epidermis, is fre- 

 quently absent or rudimentary, but can be readily demonstrated 

 in hematein-stained sections of the more highly developed hair 



