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| [
Type of Hair
| Hair
| Growth cycle
| Rate of
growth | Follicular
unit | Hair
mass ] |
|
| Hair |
| Hair is composed of keratin,
the same protein that makes up nails and the
outer layer of our skin. Hair has two parts.
Shaft: which lies above the skin (the part
that we see) Root: which lies within the skin
(which we can not see). The root sits in a
pit like recess called Follicle. No new hair
follicles form after birth. Hair growth takes
place within the hair follicle located under
the scalp. Male hormones called androgens
regulate hair growth in both men and women. |
 |
| Race |
Thickness |
Cross
section |
Colour
|
Curl |
Number
of Scalp Hair |
Density/Sq.cm |
| Caucasian |
Thin
|
Elliptical and slender
|
Blonde, red, white
or black |
Straight-wavy |
Up to 140000 |
100 roots or up to
250 hairs |
| Mongoloid (Oriental) |
Thickest-strongest |
Round |
Black |
Ruler-Straight |
Up to 100000 (much
less pubic, axillary, facial, and body
hair than of Caucasians) |
80 roots or up to 150
to 200 hairs |
| Negroid |
Easily damageable by
heat or chemicals |
Flat |
|
Tightly-Curly |
90000 |
|
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| Note:
The first hair to be produced by the fetal
hair follicles is Lanugo hair, which is fine,
soft, and un-pigmented. This is usually shed
in about the eighth month of gestation. |
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