Hair Loss: Glossary
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.
Ketoconazole: An antifungal agent that has
anti-androgenetic properties. Active ingredient in the shampoo Nizoral.
Lanugo Hair: The downy hair on the body of the fetus and
newborn baby. Resembles vellus hair, soft and unpigmented.
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onto bald regions (outdated procedure).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,
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.
Menopause: The permanent cessation of menstruation and
estrogen secretion from a woman's ovaries.
Micrograft: A very small hair graft consisting of one or
Midline: Region toward the middle of the scalp.
Miniaturization: The destructive process by which
dihydrotestosterone (DHT) shrinks hair follicles; a key marker of androgenetic
Minigraft: A small hair graft consisting of three to eight
Minoxidil: A prescription medication taken orally for the
treatment of high blood pressure and used topically to retard hair loss and/or
encourage hair growth. Generic name for Rogaine.
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
Papilla: The small root area at the base of hair, which
receives the nutrients needed for hair growth.