What are the five strata of the epidermis from superficial to deep?
The five strata of the epidermis from superficial to deep are the stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale.
The epidermis is composed of five distinct layers, or strata, each serving a specific function. From the outermost to the innermost, these layers are: the stratum corneum, which is hardened and scale-like for protection; the stratum lucidum, found only in the thick skin of the palms and soles; the stratum granulosum, which contains granules of keratin; the stratum spinosum, which provides strength and flexibility; and the stratum basale, where cell division occurs and melanin is produced.
Key points
- The epidermis has five layers from superficial to deep.
- Stratum corneum is the outermost, providing protection.
- Stratum lucidum is present only in thick skin areas like palms and soles.
- Stratum granulosum contains keratin granules.
- Stratum spinosum offers strength and flexibility.
- Stratum basale is the deepest layer, involved in cell division and melanin production.
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Kent M. Van De Graaff
Seventh EDITION · Morton Publishing Company