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Structurally, hair consists of an inner cortex, comprising spindle-shaped cells, and an outer sheath, called the cuticle. Within each cortical cell are many fibrils, running parallel to the fibre axis, and between the fibrils is a softer material called the matrix. It grows from a hair follicle.

Sometimes, the term body hair is used, to distinguish hair on the body from hair on the head. The difference between body hair and scalp hair (and, in males, chin and moustache hair) is that head hair for practical purposes grows continuously, whereas body hair alternates regular periods of growth and dormancy. During the growth portion of the cycle, body hair follicles are long and bulbous, and the hair advances outward at about a third of a millimeter per day. After a few weeks, body hair growth stops. The follicle shrinks and the root of the hair rigidifies. Following a period of dormancy, another growth cycle starts, and eventually a new hair pushes the old one out of the follicle from beneath. Head hair, by comparison, grows to great length, whereas body hair does not. Anthropologists speculate that the functional significance of long head hair is almost certainly adornment, a by-product of natural selection.

On most adult humans there are two main types of hair: terminal hair, and vellus hair. A third type, lanugo hair, is present in the fetus, and some newborn babies.

  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • MoreHair.com
    Comprehensive, up-to-date information about hair growth, hair loss, and various treatment options. Factual articles on the follicle, the growth cycle, and genetics.
  • Unbalding: Hair Today, More Tomorrow?
    by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery.
  • Rogaine.com
    Questions and answers about minoxidil hair growth solution. Pharmacia and Upjohn the manufacturers of Rogaine own this web site.
  • Norris Hair Transplant Clinic
    About the Clinic, services and procedures and contact information. Includes information on hair growth type products. Located in Knoxville.