A hair. 1: External part; 2: Sac in skin; 3: Surface of Cuticle; 4: Sebaceous membrane; 5: Bulb at base; 6: Nourishing vessel.

Hair

A hair. 1: External part; 2: Sac in skin; 3: Surface of Cuticle; 4: Sebaceous membrane; 5: Bulb at base;…