Stratum corneum

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Stratum corneum

Section of epidermis. (Stratum corneum labeled at top left.)
Latin	stratum corneum epidermidis
Gray's	subject #234 1064
Dorlands/Elsevier	s_25/12761112

The stratum corneum ("the horny layer") is the outermost layer of the epidermis (the outermost layer of the skin). It is composed mainly of dead cells that lack nuclei. As these dead cells slough off, they are continuously replaced by new cells from the stratum germinativum. In the human forearm, for example, about 1300 cells/cm²/hr are shed and commonly accumulate as house dust.

Cells of the stratum corneum contain keratin, a protein that helps keep the skin hydrated by preventing water evaporation. In addition, these cells can also absorb water, further aiding in hydration and explaining why humans and other animals experience wrinkling of the skin on the fingers and toes (colloquially called "pruning") when immersed in water for prolonged periods.

The thickness of the stratum corneum varies according to the amount of protection and/or grip required by a region of the body. For example, the hands are typically used to grasp objects, requiring the palms to be covered with a thick stratum corneum. Similarly, the sole of the foot is prone to injury, and so it is protected with a thick stratum corneum layer. In general, the stratum corneum contains 15 to 20 layers of dead cells.

In reptiles, the stratum corneum is permanent, and is only replaced during times of rapid growth, in a process called ecdysis or moulting. The stratum corneum in reptiles contains beta-keratin which provides much more rigid skin layer.