Donor area
The band of hair at the back and sides that supplies the grafts.
The horseshoe of permanent hair around the back and sides of the head. Its density and quality set the ceiling on any transplant: a plan can only ever move what the donor area can safely give up without becoming visibly thin itself. This is why a donor assessment matters more than the size of the bald area.
Related terms
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Anagen phase
The growing phase of the hair cycle.
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Crown (vertex)
The whorl at the top and back of the head.
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DHT (dihydrotestosterone)
The hormone that drives pattern hair loss.
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Follicular unit
The natural grouping of one to four hairs that grow together.
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Graft
One follicular unit, moved from the donor area to the recipient area.
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Hairline design
Where the new hairline is drawn, and at what angle.
