Everything about Stratum Lucidum totally explained
» For the layer of the hippocampus, see stratum lucidum of hippocampus.
The
stratum lucidum (
Latin for "clear layer") is a thin, clear layer of dead skin cells in the epidermis, and is named for its translucent appearance under a
microscope. It contains a clear substance called
eleidin, which eventually becomes
keratin. This layer is found beneath the
stratum corneum of thick skin, and as such is only found on the palms of the hands and the soles of the feet. The keratinocytes of the stratum lucidum don't feature distinct boundaries and are filled with eleidin, an intermediate form of keratin.
The cells of the stratum lucidum are flattened and contain an oily substance that's the result of exocytosis of lamellar bodies accumulated while the keratinocytes are moving through the stratum spinosum and stratum granulosum. It is this substance that gives the stratum lucidum its waterproof properties, and, thus, it's also called the
barrier layer of the skin.
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