Follicular unit
The natural grouping of one to four hairs that grow together.
Hair does not grow as single strands but in natural clusters of one to four, sharing a sebaceous gland and a tiny muscle. A graft is one of these units. This is why graft counts and hair counts differ: 3,000 grafts is typically 6,000 to 7,500 hairs.
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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Donor area
The band of hair at the back and sides that supplies the grafts.
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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.
