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HAIR TRANSPLANT GLOSSARY

Androgenetic Alopecia (Male Pattern Baldness)
The most common type of hair loss in men. It is caused by the genetic susceptibility of hair follicles to the hormone DHT. It affects the central and frontal area of the scalp and the crown. It may eventuate in a U-shape configuration of hair loss.

Autograft
A graft taken from one part of the body and moved to another. In a hair transplant, the follicular unit grafts are allografts.

Allograft
A graft taken from one person and grafted to another (i.e. kidney transplant). Immunosuppressive agents must be used with allograft transplants so that the grafts are not rejected by the host.

Camouflage
Camouflage in hair restoration repair involves the placement of small grafts (micro-grafts or follicular units) in front of larger ones to make them look more natural.

Club Hair (Telogen hair)
A hair that has stopped growing. One that is in the telogen (resting) phase of the hair cycle. It is anchored to the skin with its “club-like” root, but will eventually be pushed out and replaced by a new growing hair.

Dermal Papilla
The dermal papilla is situated at the base of the hair follicle. The dermal papilla is composed of fibroblasts, blood vessels and nerves. This structure is extremely important in the regulation of hair growth and is a key element in hair cloning, as the cells that make up the dermal papilla (fibroblasts) can be multiplied.

Dermis
The middle layer of skin that gives it its strength. It is made up of predominantly of collagen and contains the bulk of the hair follicle.

Donor Site (Area)
The area of the scalp (generally the back and sides) where hair-bearing skin is removed during a surgical hair restoration procedure. For hair transplants to be effective, the hair in this area must be permanent, i.e. not subject to the effects of DHT.

Follicle
The structure in the scalp that produces a hair.

Follicular Unit
Hair follicles that grow together naturally as a group. They share the same blood supply, nerves and muscle (erector pilorum). The follicular unit of the adult human scalp consists of 1-4, and occasionally 5, terminal hair follicles, 1, or rarely 2, vellus follicles and is surrounded by a band of collagen. In a follicular unit hair transplant, only intact follicular units are used in the procedure.

Follicular Unit Dissection
A hair transplant technique in which naturally occurring, individual follicular units are dissected intact from a strip of donor tissue that is removed during the hair transplant procedure. The technique involves the use of a dissecting stereo-microscope of at least 6-10x magnification to isolate the follicular unit grafts.

Follicular Unit Graft
A graft that is comprised of a single, intact follicular unit of 1-4 hairs. It is the only type of graft that is used in follicular unit hair transplant procedures.

Follicular Unit Extraction (FUE)
A procedure where individual follicular units are removed directly from the donor area. Because this hair restoration procedure often does not produce completely intact follicular units, this procedure may not be considered follicular unit transplantation in the strictest sense.

Follicular Unit Transplantation (FUT)
A method of hair restoration surgery where hair is transplanted exclusively in its naturally occurring, individual follicular units. Single strip harvesting and stereo-microscopic dissection are required in the standard definition of this hair transplant procedure. More recently, follicular unit extraction techniques are also considered a subset of this procedure.

Micro-graft
Technically, a 1-2 hair graft. It does not necessarily need to be a follicular unit, but may be two 1-hair units or part of a 3-hair unit etc. The term micro-graft is used more generally in hair transplant surgery as any small graft.