Growth Centers of Hairs

The hair follicle is a self-regenerating structure and contains a population of stem cells capable of reproducing themselves. It has been noted, at least in animal models, that a complete hair follicle can be regenerated even after the matrix-containing hair follicle is surgically removed. Although the dermal papilla is not technically part of the actual hair, it remains a very important site for future hair induction, and melanin production in terminal hairs.

Long-term hair removal has been traditionally thought to require that a laser or light source impact on one or more growth centers of hair. The major growth centers have always been thought to be in the hair matrix. However, research evaluating growth of new hair has revealed that the matrix is not the only growth center. New hairs may evolve from the dermal papilla, follicular matrix, or the "bulge." These stem cells are usually found in a well-protected, highly vascularized and innervated area, often in close proximity to a population of rapidly proliferating cells. They always remain intact and, in fact, are left behind after hair plucking. Stem cells are relatively undifferentiated both ultrastructurally and biochemically. They have a large proliferative potential, and are responsible for the long-term maintenance and regeneration of the hair-generating tissue. They can be stimulated to proliferate in response to wounding and certain growth stimuli.

How To Reduce Acne Scarring

How To Reduce Acne Scarring

Acne is a name that is famous in its own right, but for all of the wrong reasons. Most teenagers know, and dread, the very word, as it so prevalently wrecks havoc on their faces throughout their adolescent years.

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