Final answer:
The hair follicles on the face have walls made of three layers: the internal root sheath, the more keratinous external root sheath, and the glassy membrane.
Step-by-step explanation:
The walls of the hair follicles located on the forehead, top of the nose, chin, and jawline are made of three concentric layers of cells. These layers include the internal root sheath, which surrounds the root of the growing hair and extends just up to the hair shaft, the external root sheath, which encloses the hair root and is an extension of the epidermis, and the glassy membrane, which is a thick, clear connective tissue sheath that covers the hair root and connects it to the tissue of the dermis. The external root sheath tends to be more keratinous in the upper regions, providing the rigidity and strength needed for the hair follicle.