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Hair bulb, -Low & med. mag.
The hair bulb is a bulbous thickening consisting of the cellular ct of the dermal papilla and the dividing cells of the hair matrix. The matrix gives rise to the hair & the inner epidermal root sheath. The outer epidermal root sheath is replaced by mitosis of basal cells, as in the st. basale of the epidermis. Matrix cells near the apex of the dermal papilla form the hair root, while more peripheral cells form the inner epidermal root sheath. Pigment-containing melanocytes are among the matrix cells adjacent to the papilla, donating pigment to the forming hair.