Hair Structure

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Hair Structure
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Cuticle Human Hair
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Cuticle Oragutan hair
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Human Orangutan
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Slight Lifting Normal cuticle
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Cuticle damage by overperming
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Asian hair is straight and thick, and resists
damage well
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Caucasoid hair can be anything from blond to
black in color, and may be curly, wavy or
straight
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African hair is vulnerable to damage, because of
its shape and twisted structure
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Hair Bulb
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Hair follicle
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Hair shaft
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Brush down Brush up
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Hair strength
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Hair growth Cycle
HAIR FACTS

The phases of the hair growth cycleIt 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 daysThe 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                                                        
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The phases of the hair growth cycleIt 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 daysThe 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
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A method of measuring the rate of hair growth
both cut hairs and newly emerging hairs can be
seen
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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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Electronmicrograph showing new hairs emerging
from the hair follicles of the scalp
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Zinc deficiency Normal
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Hair density patterns
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Normal Telogen Phase haircompound e-
micrograph
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An anagen hair that has been plucked out notice
the soft, sticky tail
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A hair, carrying some normal fragments of debris,
seen under the electron microscope