What structures in the skin are responsible for hair production?

Hair follicles are the structures in the skin responsible for hair production. These are specialized invaginations of the epidermis that extend into the dermis, providing a root for the hair strand to grow. Within the hair follicle, a structure known as the hair bulb contains the actively dividing cells that lead to the formation of hair.

As the cells in the bulb multiply, they keratinize and die, forming the hair shaft that is ultimately pushed up through the skin’s surface. This process of hair growth is influenced by various factors including hormones and genetics.

Other options, while related to skin and hair health, do not directly contribute to hair production. Sebaceous glands secrete an oily substance that helps to keep hair and skin lubricated but are not involved in the production of hair itself. Follicle units generally refer to a concept in hair restoration or skin grafting, rather than a specific anatomical structure responsible for hair production. Dermal papillae are small, nipple-like projections in the dermis that provide nutrients and support to the hair follicle but are not the structures that create hair.