Hairs appear as solid epidermal proliferations penetrating the underlying dermis (Fig. 18.3 A). At their terminal ends, hair buds invaginate. The invaginations, the hair papillae, are rapidly filled with mesoderm in which vessels and nerve endings develop (Fig. 18.3, B and C). Soon cells in the center of the hair buds become spindle-shaped and keratinized, forming the hair shaft, while
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