Squamous epithelium
Squamous Epithelium
Squamous epithelium (pronounced: SKWAY-mus eh-pih-THEE-lee-um) is a type of epithelial tissue that consists of a single layer of flat cells that resemble scales, hence the name 'squamous', which is derived from the Latin word 'squama', meaning 'scale'.
Etymology
The term 'squamous epithelium' is derived from the Latin word 'squama', which means 'scale', and the Greek word 'epithelion', which means 'covering'. This is due to the scale-like appearance of the cells in this type of tissue.
Structure
Squamous epithelium cells are flat and thin, allowing for rapid passage of substances. They are found in areas of the body where rapid diffusion is required, such as the alveoli of the lungs and the glomeruli of the kidneys.
Function
The primary function of squamous epithelium is to provide a barrier to prevent the entry of foreign substances into the body and to facilitate the diffusion of oxygen and nutrients into the body's tissues.
Related Terms
- Epithelial tissue: The type of tissue that squamous epithelium belongs to.
- Simple squamous epithelium: A subtype of squamous epithelium that consists of a single layer of flat cells.
- Stratified squamous epithelium: A subtype of squamous epithelium that consists of multiple layers of flat cells.
- Pseudostratified squamous epithelium: A subtype of squamous epithelium that appears to have multiple layers due to the irregular positioning of the nuclei within the cells, but actually consists of a single layer of cells.
External links
- Medical encyclopedia article on Squamous epithelium
- Wikipedia's article - Squamous epithelium
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