A hair follicle is an important component of the skin. The skin is also known as the "integument", or "integumentary system".
More specifically, a hair follicle is the sheath of epidermal cells and connective tissue that surrounds the root of a hair.
It is composed of two layers of epidermal cells, which are called the internal root sheath and the external root sheath, surrounded by a connective tissue sheath.
For more detailed information together with a diagram see the structure of a hair follicle.
To view the location of hair follicles relative to the other key components of the skin see the diagram of the structure of the skin. This may be of particular interest to students of courses in massage, reflexology, beauty therapies, and other health science or clinical courses.