Alopecia
Baldness. There are many types of alopecia, each with a different cause. Alopecia may be localized to the front and top of the head as in common male pattern baldness. It may be patchy as in a condition called alopecia areata. Or it can involve the entire head as in alopecia capitis totalis

Anagen
the active growth phase of hair follicles.

Anterior
Front

Bleached knots
Created by literally bleaching the knots of the hair system where the hair is tied in to create the appearance of hair growing from the scalp

Bonding
Gluing or taping a hair replacement system to the scalp

Catagen
The stage between Anagen (the growing stage) and

Telogen
(the resting stage) in hair growth.

Cortex
The layer of the hair shaft containing pigment-storing cells

Crown
The highest part of the head.

Cuticle
The outer surface of hair, composed of overlapping scales made of colorless keratin protein. It gives hair luster and shine.

Dermis
The lower or inner layer of the two main layers of tissues that make up the skin

DHT
a male hormone that is suggested to be the main cause for the miniaturization of the hair follicle and for hair loss.

Epidermis
the outermost layer of skin

Female Pattern Baldness
A hereditary pattern of baldness found in women typically characterized by a diffuse thinning of hair and/or hair loss at the front portion of the scalp behind the frontal hairline. May or may not include a slight recession or thinning in the temples and only very rarely ends in complete baldness at the top of the scalp. Also called "Female Hereditary Hair Thinning."

Follicle
saclike structure just below the surface of your scalp. The sheath within which hair grows

Genetic
Inherited; having to do with information that is passed from parents to children through genes.

Grafting
the removal of hair bearing scalp from the back of the head to a recipient site

Hair Graft
Transplanted hair

Hair Transplant
A surgical technique that transfers hair follicles from the donor area to the recipient area.

Hair Integration
using hair systems or prosthetics to improve the esthetic appearance of the hair

Hair Shaft
the part of the hair seen above the skin

Keratin
tough, fibrous, insoluble protein forming hair and finger nails

Male Pattern Baldness
An inherited condition in men which is triggered by the hormone Dihydrotestosterone which causes gradual miniaturization (and eventual loss) of hair follicles. Starting anytime after puberty with a recession of the hairline and thinning of the crown areas, it can eventually lead to complete baldness at the top of the scalp. The areas around the sides and back of the scalp are not typically affected by male pattern baldness.

Midline
Region towards the middle of the scalp

Norwood Scale
a scale for the classification of hair loss

Occipital Bone
The bone that forms the rear bottom of the skull

Oxidation
The process of hair lightening in color due to environmental factors

Papilla
The small root area at the base of hair, which receives the nutrients from the follicle needed for hair growth

Posterior Scalp
Back of the head

Prosthetic
An artificial device serving as a substitute for a missing or damaged body part.

Recipient Site
bald or thinning area into which hair grafts or plugs are transplanted

Scalp Reduction
A procedure that removes bald scalp and brings the edges of hair-bearing scalp closer together. Scalp reduction is most often used in patients with crown baldness.

Telogen
The resting stage of hair cycle which lasts around 3 months.

Temporal Point
The two triangular shaped areas of hair located in the lower outer corners of the forehead, where the temporal hairline meets the sideburns.

Terminal Hair
The coarser, pigmented hair that appears on the scalp, face, armpits, and pubic areas.

Temporal Recession
Hair loss in the temple region

Topically
directly applied on the skin

Vertex
top of the head, including the region between the eyes

Vellus Hair
Fine baby peach-fuzz hair that is not easily visible to the naked eye. They lack a central medulla, which is present in thick terminal hairs.