Understanding Hair Transplants and Hair Loss - Pacific Hair

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Understanding Hair Transplants and Hair Loss - Pacific Hair

Human Hair : Growth Cycle

Anagen Catagen Telogen

ACTIVE

GROWTH PHASE

2-6 Years

Figure #5

Club Hair

TRANSITION

PHASE

1 - 2 Weeks

Figure #5 illustrates the four growth cycles of a human hair . Note that human hairs

generally grow for two to six years in the anagen phase, and then shift into the catagen

and subsequently telogen phase . The telogen phase usually lasts about three months .

During telogen, the hair becomes loose and falls out, and the hair follicle withers up and

virtually disappears . This is shown in the illustration of return to anagen . Miraculously,

after about three months, the hair follicle regenerates

Hair Fiber : Characteristics

(from the interaction of two types of stem cells, those

from the bulge area around the sebaceous gland, and

others from the epithelial layer .) Following this, the regenerated

hair follicle generates a new hair, which then

grows for two to six years .

Figure #6 illustrates the differences in hair shaft characteristics

between straight hair, curly hair, and very

curly to wooly hair . Note it is simply a difference in

the shape of the cross-sectional area of the actual

hair shaft. In other words, round hairs generally grow

straight, and oval hairs grow in various degrees of

curliness .

Figure #6

U n d e r s t a n d i n g H a i r T r a n s p l a n t s a n d H a i r L o s s

Dermal

papilla

RESTING

PHASE

5-6 Weeks

Secondary

germ cells

RETURN TO

Anagen

Hair Matrix

forming new hair

RESTING

PHASE

5-6 Weeks

15

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