390 



Epidermis. 



HISTOLOGY 



Cells of the hair canal. 



Epithelial Part of a 

 bed. hair 



column. 



Tip of the 



inner 

 sheath. 



, V Arrector 

 u muscle. 



FIG. 394. VERTICAL SECTION OF THB 

 SKIN OK THE GLUT^AL REGION 

 OF A HUMAN EMBRYO OF FIVE 

 MONTHS. X 230. 



Root of 

 the hair. 



FIG. 395. VERTICAL SECTION OF THE 

 SKIN OF THE BACK OF A HUMAN 

 EMBRYO OF FIVE AND A HALF 

 MONTHS. X 230. 



Sebaceous 

 gland, 



Outer 



sheath. 



Epithelial 

 bed. 



Hyaline membrane. 

 Papilla. 



Tangential section of the outer sheath. ,- ' ~+*f *?** **^ 

 Cornified inner sheath. 



Cell nuclei of the sheath cuticle 

 of 



FIG. 396. VERTICAL SECTION OF THE SKIN OF THE FOREHEAD OF A HUMAN 

 EMBRYO OF FIVE MONTHS. X23O. Differentiation of the sheaths of the hair. 



