Each hair grows approximately at the rate of 1 centimeter per month. This growth continues for 2-6 years. When the hair attains full growth it resets for 2-3 months and is later shed.
A new hair starts growing in its place. Thus at any given point of time 10 percent of the total hair on our scalp is in a resting phase and 90 percent of the hair is in growth phase.
2 STRUCTURES OF HAIR
1. Follicle - The opening of the skin, which contains the hair shaft and root. It is the point from which hair grows.
2. Shaft - the non growing portion of a hair that protrudes from the skin, from the follicle and contains 3 layers.
3 LAYERS OF HAIR SHAFT – Each strand of hair contains:
1. Cuticle – outer layer (gives shiny appearance). Protects the cortex.
2. Cortex – middle layer between the cuticle and medulla
Determines the texture and strength of the hair, contains pigment and keratin
3. Medulla – innermost layer
3 PHASES OF THE HAIR CYCLE
1. Anagen Phase – hair growth phase
Approximately 80% to 90% of our hair is in this phase at any given time.
Approximately 80% to 90% of our hair is in this phase at any given time.
2. Catagen Phase – the transition phase where hair growth begins to shut down and stop activity. Approximately 2% of our hair is in this phase at any given time.
3. Telogen Phase - the resting phase
Approximately 10% to 18% of our hair is in this phase at any given time.
Approximately 10% to 18% of our hair is in this phase at any given time.
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