Hair follicles perpetually goes through three different stages. The normal cycle of hair growth lasts for 2 to 6 years. This stage is called the Anagen stage. During this stage hair will grow approximately one (1) centimeter (less than half an inch) per month. About 90 percent of the hair on your scalp is growing at any one time. About 10 percent of the hair on your scalp is in the involution phase, also called the Catagen phase which lasts about 2 weeks. The hair then enters the Telogen or resting phase for 2 to 3 months. At the end of the resting phase hair follicles falls out and a new hair starts.
The most important structure of a hair follicle is the dermal papilla, which is responsible for hair growth. The cell of this dermal papilla divides and differentiates to form a new hair follicle. As this dermal papilla lies in direct contact with blood capillaries of the skin, it is responsible for deriving nutrients for hair follicle growth. This dermal papilla has many receptors for androgens; where men have more androgenic receptors here than women.
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