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5 Cards in this Set
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- Back
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stratum basale
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single layer of columnar epithelium. intense mitotic activity here. melanocytes are present in this layer. (melanoma)
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stratum spinosum
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eight to ten rows of polygonal cells which are keratocytes or "prickle cells". they are responsible for the development of the kerotin precursor-the cells are held together by "spot welds" called desmosomes. Melanocytes are also present in this layer
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stratum granulosum
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three to five rows of flattened cells that contain granules of keratohyalin which is a step in the formation of keratin. Nuclei are called pyknotic which means that they are in various stages of degeneration. (cells are dying)
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stratum lucidum
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consists of several rows of clear, flat, dead cells that contain droplets of a substance called eleidin. eleidin is formed from keratohyalin and is eventually transformed into keratin. (palm of hands and soles of feet)
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stratum corneum
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consists of 25 to 30 rows of flat, dead cells completely filled with keratin. these cells are continuously shed and replaced.
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