In scalp hair transplants, the procedure will consist of using naturally growing follicular units containing 1-4 hairs. This number of hairs is good enough to achieve the natural look.
For eyebrow transplants, the procedure will consist of using individual hair follicles to be inserted; one hair for each minute puncture. A more meticulous process will be employed for one thing: the direction of eyebrow hair. This direction will depend on the part of the brow where it is growing from. The hair usually forms a pattern that subtly comes together to form an ascent following the normal curve of the brow.
Another thing is that eyebrow hair also grows from the follicle at a sharp angle. This sharp angle will allow the brow hairs to lay flat as compared to scalp hair that grows at a 45-degree angle from the scalp. There should be proper angling of the follicle because it is the most important aspect of any eyebrow transplant.
A third difference is that eyebrow hairs consistently contain single-strand follicles while scalp hair can have as many as four hairs in one follicle.
Finally, consider the lifespan of the hair. Eyebrow hair has a "lifespan" of at least four months before it falls off. Hence, the length is always short. Your scalp hair has a lifespan of about seven years long.
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Source: http://www.articlealley.com/article_1073713_23.html
Source: http://www.articlealley.com/article_1073713_23.html

