The answer is terminal hair. That's the name for the long, coarse hair that grows on an adult's scalp, arms, and legs.
Terminal hair replaces the short, fine vellus hair (sometimes called lanugo) that covers most of the body before puberty — hormonal changes trigger that switch in certain areas. Medulla isn't a hair type at all; it's a layer inside the hair shaft, which is why it's a distractor here, not a real answer.
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