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Accessory structures of the skin
columns of dead keratinocytes held together by proteins with two main regions
first region, portion above the skin, have three circular layers of cells
second region, portion under the skin thru epidermis down to dermis, have three cicular layer of cells
inner, central layer
thickest layer surrounds the medulla, majority of the shaft makes up most of the hair
outter layer, made of a single row of keratinocytes