The Biology of Hair - Part II
The phases of the hair growth cycle It is easy to remember the lengths of the different phases ofthe growth cycle. Very roughly speaking:
Anagen 1000 days (or more)
Aatagen 10 days
Telogen 100 days
The hair growth cycle, showing the changes from the growing of a new hair (anagen) to its shedding (telogen): notice how in anagen the hair bulb lies deep inside the scalp and then rises towards the surface before the hair is shed, then moves down again as the new hair grows.
Additional Information:
The hair growth cycle
Normal hair growth happens in a cycle of 3 oddly named phases: Anagen, Catagen and Telogen. Every single hair goes through these phases, each relating to different states of activity. Read on to find out what on earth they mean.
The hair growth cycle
Normal hair growth happens in a cycle of 3 oddly named phases: Anagen, Catagen and Telogen. Every single hair goes through these phases, each relating to different states of activity. Read on to find out what on earth they mean.
PHASE 1 – the Anagen, or growing phase
The Anagen phase is the growing phase, or the 'on' phase. It lasts for an average of approximately 1,000 days in the human scalp, but can last as long as six years! During the Anagen phase hair cells multiply rapidly. The hair shaft grows in diameter and the hair reaches maximum length.
PHASE 2 – the Catagen, or transitional phase
The Catagen phase lasts only one to two weeks. It is the transitional or regressive phase, when the hair stops growing before the resting phase begins.
PHASE 3 – the Telogen, or resting phase
The Telogen is the final resting stage, or 'off' phase which lasts for about five or six weeks. Towards the end of the Telogen phase, activity in the hair follicle starts again. A new hair in the Anagen phase develops and forces the old Telogen hair out, hopefully onto your pillow or into the plughole but occasionally into your dinner.
At any one time, around 90 per cent of most people's hair follicles are in the Anagen, or growing, phase and approximately 10 per cent are in the Telogen, or resting, phase.
Anagen 1000 days (or more)
Aatagen 10 days
Telogen 100 days
The hair growth cycle, showing the changes from the growing of a new hair (anagen) to its shedding (telogen): notice how in anagen the hair bulb lies deep inside the scalp and then rises towards the surface before the hair is shed, then moves down again as the new hair grows.
Additional Information:
The hair growth cycle
Normal hair growth happens in a cycle of 3 oddly named phases: Anagen, Catagen and Telogen. Every single hair goes through these phases, each relating to different states of activity. Read on to find out what on earth they mean.
The hair growth cycle
Normal hair growth happens in a cycle of 3 oddly named phases: Anagen, Catagen and Telogen. Every single hair goes through these phases, each relating to different states of activity. Read on to find out what on earth they mean.
PHASE 1 – the Anagen, or growing phase
The Anagen phase is the growing phase, or the 'on' phase. It lasts for an average of approximately 1,000 days in the human scalp, but can last as long as six years! During the Anagen phase hair cells multiply rapidly. The hair shaft grows in diameter and the hair reaches maximum length.
PHASE 2 – the Catagen, or transitional phase
The Catagen phase lasts only one to two weeks. It is the transitional or regressive phase, when the hair stops growing before the resting phase begins.
PHASE 3 – the Telogen, or resting phase
The Telogen is the final resting stage, or 'off' phase which lasts for about five or six weeks. Towards the end of the Telogen phase, activity in the hair follicle starts again. A new hair in the Anagen phase develops and forces the old Telogen hair out, hopefully onto your pillow or into the plughole but occasionally into your dinner.
At any one time, around 90 per cent of most people's hair follicles are in the Anagen, or growing, phase and approximately 10 per cent are in the Telogen, or resting, phase.
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