Hair Loss Glossary

  Alopecia Areata: Immune system disorder in which hair follicles stop producing hairs.

  Anagen: One phase of the hair growth cycle, during this stage hair is actively growing.

  Androgens: Male hormones that produce and protect male characteristics within the male body.  The common being testosterone. 

  Canites: Term given to grey hair, it is actually a mixture of white and colored hairs.

  Catagen: Transition phase of the hair growth cycle.  It lasts approximately 2-3 weeks, and signals the end of active growth.

  Cortex: The middle layer of hair, the pigment of the hair is contained here.

  Cuticle: The outer layer of hair, typically comprised of 6-8 layers of overlapping cells.

  Dihydrotestosterone: or DHT is a hormone produced from testosterone present in the scalp.

  Germinal Matrix: The source of hair growth.

  Hair bulb: The base of a hair.

  Hair follicle: The hole in the scalp through which a hair grows.

  Hair root: The portion of the hair that stretches from the surface of the skin to the hair bulb.

  Hair shaft: The section of the hair that extends above the surface of the skin.

  Keratin: The protein that hair is composed of.

  Male pattern baldness: The natural occurrence of hair loss in men.

 Pigment: Substance that gives color.  There are two types of hair pigments, melanin (black or brown hair color) and pheomelanin (red or yellow hair color).

  Sebum: An oily substance that is produced by the sebaceous glands.

  Telogen: resting stage of the hair growth cycle just prior to hair growth recommencement.

  Toxic Alopecia: Sudden loss of hair resulting from exposure to chemicals or radiation (one example is chemotherapy).

  Traction Alopecia:  Loss of hair ensuing from regular pulling.  Some examples are tight braiding (corn rows), over exposure to chemicals (bleach, permanent waves), and extreme heat.

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