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As explained it the previous section, Male Pattern Baldness (Androgenetic Alopecia) is
caused by the Dehydro-Testosterone hormone. It usually progresses in the following pattern: at first, the hair in
the temples and in the crown area(the area around the point out of which the hair grows in a swirl-like
manner) starts thinning. The frontal hair line then begins to recede,
the temples grow bigger and the crown areas noticeably balds. Later on the two bald
areas at the front and back meet at the center of the scalp, and eventually there is only a
horseshoe shaped piece of hair that surrounds the head. The
Norwood-Hamilton
Scale
illustrates the different stages that characterize the Male Pattern Baldness process:
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The Norwood-Hamilton Male Pattern Baldness Scale |
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The Fact that the areas on the sides of the head and on its back do not bald, is because
the hair follicles there are not sensitive to Dehydro-Testosterone. The reason for that is yet to be
determined, but experts believe that it goes far back to the embryonic period. The skin
layer that covers the resistant areas is a part of the layer developed on the posterior part
of the fetus body, whereas the layer that covers the sensitive ones comes from the front.
Due to the existence
of Dehydro-Testosterone resistant areas
hair transplant
procedures are possible, and we will
discuss those later on.
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