Why Not Transplant Hair From the Arm to the Eyebrow?

Hello
I had a question about hair transplantation for eyebrows. Ive read through the blog and many articles about this kind of procedure. What am wondering about is, why take hair from the scalp when we know it will act like the hair from the scalp, growing 3 feet or so when using hair from the arm won`t grow any longer than an avergae eyebrow hair.

Would that be a possibility, to actally take hair from the arm insead of the scalp, and not needing to trim the eyebrows after the procedure?

Arm hair will grow like arm hair so you are correct that for delicate eyebrows in a coarse haired person, head hair may be too thick and arm hair in theory might be better. Now with that said, the problem with arm hair is that the telogen (sleep) cycle for the hair is longer than the growth cycle. If you place 10 arm hairs in the eyebrow, only 2-4 of them will be growing at any one time while the rest is in telogen. To address this problem, you would have to transplant at least twice the number of hairs to achieve the targeted densities. Great idea, just not the right hair sleep cycle.