HAIR GROWTH PHASES

The hair is indeed a woman’s beauty hence the need for it to be given utmost care to promote its beauty and bounce. Adequate hair care entails detailed knowledge of what the hair is made of and its growth pattern, that way its nutrient needs can be met adequately.

Stemcells

Stemcells are responsible for hair production while the hair follicle is the mammalian skin organ that makes the hair. Hair follows a precise growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen phases. Each phase has specific characteristics that determine the length of the hair. All three phases occur simultaneously; one strand of hair may be in the anagen phase, while another is in the telogen phase. Once the cycle is complete, it restarts and a new strand of hair begins to form. The rate or speed of hair growth is about 1.25 centimetres or 0.5 inches per month, or about 15 centimetres or 6 inches per year.

 Anagen phase

The anagen phase is known as the growth phase and it starts in the papilla. The papilla is a large structure at the base of the hair follicle made up mainly of connective tissue and a capillary loop. Cell division in the papilla is either rare or non-existent and can last from two to six year. The span at which the hair remains in this stage of growth is determined by genetics. The longer the hair stays in the anagen phase, the faster and longer it will grow. During this phase, the cells in the papilla divide to produce new hair fibers, and the follicle buries itself into the dermal layer of the skin to nourish the strand. About 85% of the hairs on one's head are in the anagen phase at any given time.

Catagen phase

The catagen phase begins when Signals sent out by the body ends the anagen phase . The catagen phase,also known as the transitional phase, allows the follicle to, in a sense, renew itself. During this time, which lasts about two weeks, the hair follicle shrinks due to disintegration and the papilla detaches and "rests," cutting the hair strand off from its nourishing blood supply. Ultimately, the follicle is 1/6 its original length, causing the hair shaft to be pushed upward. While hair is not growing during this phase, the length of the terminal fibers increases when the follicle pushes them upward.

Telogen phase

During the telogen, or resting, phase the hair and follicle remain dormant anywhere from 14 months. Ten to fifteen percent of the hairs on one's head are in this phase of growth at any given time. The anagen phase begins again once the telogen phase is complete. The preceding hair strand is pushed up and out by the new, growing strand. The process causes the normal hair loss known as shedding.
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