566 



THE SKIN. 



mucosum itself. The strata are cuboidal epithelia, and it is only 

 the layer nearest the derma, or, more properly, the structureless 

 membrane, which is formed by columnar epithelium. The inner 

 surface of the structureless membrane, again, is covered by 



FIG. 235. THE UPPER PORTION OF THE HAIR-POUCH 

 FROM THE HUMAN SKIN. 



E, epidermis ; RM, rete mucosum ; PL, papillary layer ; D, derma; F, follicle ; M, arrector 

 pili muscle ; SG, sebaceous gland ; OS, outer root-sheath ; IS, inner root-sheath ; C, cuticle ; 

 -B, root of hair. Magnified 150 diameters. 



extremely delicate flat endothelia, as was first demonstrated, by 

 the aid of silver-staining, by V. Czerny. These endothelia are 



