EPIDERMIS Meaning and
Definition
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The epidermis is the outermost layer of the skin, which serves as a protective barrier to the underlying tissues and organs. It is composed of multiple layers of epithelial cells that cover the entire surface of the body and is an integral part of the integumentary system.
The epidermis primarily functions to prevent the loss of water, regulate body temperature, and shield the underlying tissues from harmful external factors such as pathogens, UV radiation, and physical trauma. It also participates in the production of vitamin D when exposed to sunlight.
The epidermis consists of four distinct layers: the stratum corneum, stratum lucidum (only present in certain areas such as the palms and soles), stratum granulosum, and stratum basale. The stratum corneum is the outermost layer, consisting of dead skin cells called keratinocytes that are constantly shed and replaced, thereby providing continuous renewal and regeneration of the skin.
The epidermis contains various specialized cells, such as melanocytes that produce melanin, contributing to skin color, and Langerhans cells that participate in immune responses. It is also rich in nerve endings, enabling the perception of touch, temperature, and pain. Overall, the epidermis plays a crucial role in maintaining the overall health and integrity of the skin and the body as a whole.
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Scarf-skin, cuticle, the outer epithelial portion of the skin; it consists of five layers or strata, called, from without inward, stratum corneum or horny layer, stratum lucidum or clear layer, stratum granulosum or granular layer, stratum mucosum or mucous layer, and stratum germinativum or germinative layer; by some histologists the last two layers are regarded as one, called either stratum germinativum or stratum mucosum.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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The scarf or outer skin of the body; the cuticle; the outer coating of a plant or tree; also epiderm.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
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Etymology of EPIDERMIS
The word epidermis has its roots in Ancient Greek. It is derived from the Greek words epi meaning upon or over and derma meaning skin. Therefore, the word epidermis essentially means upon the skin or outer layer of skin.
Similar spelling words for EPIDERMIS
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