| A | B |
|---|
| Trichology | The scientific study of hair, its diseases, and care. |
| Hair Follicle | The tube-like depression or pocket in the skin or scalp that contains the hair root. |
| Hair Bulb | The lowest area or part of a hair strand, it is the thickened, club-shaped structure that forms the lower part of the hair root. |
| Dermal Papilla | Small, cone-shapted elevation located at the base of the hair follicle that fits into the hair bulb; it contains the blood and nerve supply that provides the nutrients needed for growth. |
| Arrector pili muscle | Minute, involuntary muscle fibers int eh skin inserted in the base of the hair follicle. |
| Sebaceous glands | The oil glands of the skin and are connected to the hair follicles. |
| Hair Cuticle | The outermost layer of the hair; it consists of a single, overlapping layer of transparent, scale-like cells that overlap like shingles on a roof. |
| Cortex | The middle layer of hair; it is a fibrous protein core formed by elongated cells containing melanin pigment. |
| Medulla | Innermost layer. It is composed of round cells. |
