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epidermis structure
Question | Answer |
---|---|
basale | one layer thick cell is cuboidal to columnar in shape cells containing melanocytes, continuous cell division occurs in this region. (BIRTH) |
spinosum | made up of several layers they appear to be thorn like or spiny active living normal keratinocytes they have not started to die yet (LIFE middle age) |
granulosum | cells start to die. the first thing you notice is that they have specs in the cytoplasm-granules.it consists of 3-5 layers in thick skin and 2-3 in thin skin. they develop darkly staining granules of a substance called "keratohyalin"-precursor of keratin |
lucidum | dead flat cell that is clear. here the keratohyalin becomes Eleidin which will become keratin in the stratum corneum |
corneum | dead surface layers-in thick skin it is 25-30 layers thick, 3-5 in thin skin. makes calluses on feet and hands. the extra thick protective layer |