For cementogenesis to begin, Hertwig's epithelial root sheath must fragment.

The term "trichilemmal" refers to the outer root sheath.

Cell division in the hair matrix produces the cells that form the major structures of the hair fiber and the inner root sheath.

The root sheath is composed of an external and internal root sheath.

It has been suggested that the condition may result from premature keratinization of the inner root sheath.

The bulge is in the outer root sheath at the insertion point of the arrector pili muscle.

Gli2 is expressed in the interfollicular epidermis and the outer root sheath of hair follicles in normal human skin.

The hair matrix produces the actual hair shaft as well as the inner and outer root sheaths.

The cuticle of the root sheath is in the center, continuous with the outermost layer of the hair fiber.

Trichilemmal cysts are derived from the outer root sheath of the hair follicle.