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Hair Cycle: Growth periods are followed by follicular regression and consequential hair loss. No hair therefore grows continuously. This hair cycle, which dictates the ultimate hair length attainable by an individual, is explained under the following headings:-
Anagen: The period of follicle regeneration and active growth of scalp hairs is from 2-7 years.
Hairs in the anagen phase grow faster during the early years. Average growth rate is 1-2 cm per month.
Catagen: the preliminary stage of the retrogressive catagen phase during which changes can occasionally be seen above the skin surface with the naked eye: e.g. loss of pigment and the narrowing of the hairshaft accompanied by a narrowing and eventual loss of the medulla. During this short period of change (approximately 2 weeks) the follicle rests the dermal papilla stops production of new cells, the dentrites and melanocytes contract and melanin production ceases. The follicle and epithelial sheath contract and the hairshaft is ejected.
Telogen: the resting phase of the follicle lasts approximately four months. The follicle remains quiescent in its shortened state and awakens to regenerate with the onset of the new Anagen phase....
Rate of Growth
Normal Caucasian hair growth rate is 1-2 cm per month. Researchers have shown that this rate of growth may reduce beyond the length of approx. 27cm. Afro-Caribbean hair growth rate is approximately half that of Caucasian, and due to the fragility of their multi-helixal structure, rarely attain great length. Asian hair-shafts grow rapidly exceeding the average for Caucasians and may attain great length.
In the majority of humans, terminal hair is straight and is circular in cross section - such hair-shafts having emerged from host follicles with similar characteristics. If however, due to genetic factors or skin injury the follicle is:
<ul type="square">Of a spiral or zigzag structure; the hair-shaft will emerge in conformity and exhibit appropriate helices. This is demonstrated by many with the Afro-Caribbean type hair, and also occasionally as a result of pressure employed during multiple hair follicle transplantation surgery.[/list] <ul type="square">Naturally flattened, imperfect, oval or kidney shape; the hair-shaft will emerge exhibiting waves/curls of appropriately varying degree. Numerous factors incidental to natural healthy life can influence hair formation. Other aberrations may result from ill health, drug therapy and ageing etc.[/list]
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Taken from The Trichology Society
website: http://www.hairscientists.org/article9.htm
But don't lose heart, Dejuan.
Diane Witt's hair baffled scientists since it just kept on growing, so you never know; yours might be the next miracle.
Just continue to exercise the power of positive thinking.