GENERAL HISTOLOGY

Detailed explanation-1: -Each hair sits in a cavity in the skin called a follicle.

Detailed explanation-2: -A shaft or opening on the surface of the skin through which hair grows.

Detailed explanation-3: -The hair follicle begins at the surface of the epidermis. For follicles that produce terminal hairs, the hair follicle extends into the deep dermis, and sometimes even subcutis. Meanwhile, follicles producing vellus hairs extend only to the upper reticular dermis.

Detailed explanation-4: -The inner root sheath (IRS) is an important structure of the lower part of the hair follicle that surrounds and protects the growing hair. It lies between the hair in the center and the outer root sheath (ORS) peripherally, and all these three structures are derived from the matrical cells of the follicular bulb.