hair structure. cuticle – human hair cuticle – oragutan hair
Post on 14-Dec-2015
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HAIR FACTS
The phases of the hair growth cycle
It is easy to remember the lengths of the different phases of
the growth cycle. Very roughly speaking:
anagen 1000 days (or more)
catagen 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
Hair growth Cycle
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) catagen 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
Differences in hair length depend on the length of anagen, which is genetically determined. These two people started off with hair of the same length and went without a haircut for 18 months: the man's hair grows only to his collar before it falls out naturally, but the woman's anagen period is clearly much longer
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