Scanning Electron Micrograph (SEM) of the overlapping, squamous cells of the epidermis of the human foot. These cells comprise the ridges and grooves of the sole of the foot, which appear in early embryonic development and are determined by hereditary factors. Here, 2 ridges are seen (running left to right): the fissure (bottom, right) on the lower ridge is the opening of a sweat gland duct. Mag. X 440 (10x8).
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