Isthmus: The middle region of the hair follicle which usually contains the sebaceous gland.
Juri Flap: Surgical procedure that takes a large section of hair-bearing scalp from the side of the scalp and rotates it 180 degrees to the front, forming a hairline.
Keratin: A tough, fibrous, insoluble protein forming hair and finger nails.
Linear Graft: A row of hair and skin that is transplanted onto bald regions (outdated procedure).
Male Pattern Baldness (MPB): The most common type of hair loss; caused by hormones, genes, and age, it is usually progressive in nature. It affects the central and frontal area of the scalp and often results in a pronounced U-shape configuration.
Medulla: A central zone of cells present only in large, thick hairs.
Melanin: Pigmenting granules within the keratin fibers of the hair shaft that determine hair color. They usually decrease with age, resulting in gray or white hair.
Melanocyte: A specialized cell containing pigment (melanin), which determines hair color.
Micrograft: A very small hair graft consisting of one or two hairs.
Midline: Region toward the middle of the scalp.
Miniaturization: The destructive process by which dihydrotestosterone (DHT) shrinks hair follicles; a key marker of androgenetic alopecia.
Minigraft: A small hair graft consisting of three to eight follicles each.
Nonscarring Alopecia: A broad category of different types of hair loss, including androgenetic alopecia. The hair follicle remains intact, thus increasing the likelihood that hair loss can be reversed.
Norwood Scale: A scale for the classification of hair loss.
Papilla: The small root area at the base of hair, which receives the nutrients needed for hair growth.