Layer

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Layer (Medicine)

Layer (/ˈleɪər/), from the Old English laegere meaning "one who lays", is a term used in various fields of medicine to describe a level or stratum of cells or tissue.

Anatomy

In anatomy, a layer refers to a group of cells that collectively form a barrier or interface between two compartments. For example, the epidermis is the outermost layer of the skin, protecting the body from environmental factors.

Histology

In histology, layers are used to describe the organization of cells within tissues. For example, the mucosa of the gastrointestinal tract is composed of three layers: the epithelium, the lamina propria, and the muscularis mucosae.

Radiology

In radiology, the term layer is used to describe the different levels of tissue density seen in imaging studies. For example, in a computed tomography (CT) scan, the different layers of the brain can be visualized, including the grey matter and white matter.

Related Terms

  • Stratum: A synonym for layer, often used in histology.
  • Lamina: A thin layer or plate of tissue.
  • Zona: A term used to describe a layer within an organ or tissue.

See Also

External links

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