Definition: layers of cells that line hollow organs and glands. Accessed 27 Nov. 2020. An example is the epidermis, the outermost layer of the skin. Medical Definition of epithelium : a membranous cellular tissue that covers a free surface or lines a tube or cavity of an animal body and serves especially to enclose and protect the other parts of the body, to produce secretions and excretions, and to function in assimilation Delivered to your inbox! Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. The purely cellular avascular layer covering all free surfaces, cutaneous, mucous, and serous, including the glands and other structures derived therefrom. Test Your Knowledge - and learn some interesting things along the way. Squamous epithelium is classified as endothelium, which lines the blood vessels and the heart, and mesothelium, which lines the serous cavities. Epithelium:The outside layer of cells that covers all the free, open surfaces of the body including the skin, and mucous membranes that communicate with the outside of the body. Epithelium consisting of flat, platelike cells in a single layer. Membranous tissue composed of one or more layers of cells separated by very little intercellular substance and forming the covering of most internal and external surfaces of the body and its organs. Epithelium with the cells in layers; mitosis takes place in the lowest layer. A band of nonkeratinized stratified squamous epithelium that attaches both to the gingiva (on one side) and the crown of the tooth (on the other). It is also those cells that … the cellular covering of internal and external surfaces of the body, including the lining of vessels and other small cavities. https://medical-dictionary.thefreedictionary.com/epithelium. The cells vary in structure according to their function, which may be protective, secretory, or absorptive. Fecal is the medical term meaning pertaining to stool. Medical terminology Glossary of medical terms . Send us feedback. Combined epithelial layers of the enamel organ, which form a protective layer over the enamel crown as it erupts and then become the primary epithelial attachment surrounding the tooth. Please tell us where you read or heard it (including the quote, if possible). Epithelium composed of cylindrical cells. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Its ability to regenerate is excellent; it may replace itself as frequently as every 24 hr. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Can you spell these 10 commonly misspelled words? The purely cellular avascular layer covering all the free surfaces, cutaneous, mucous, and serous, including the glands and other structures derived therefrom. Cells making up the epithelium may be flat (squamous), cube-shaped (cuboidal), or cylindrical (columnar). Learn a new word every day. ( ˌɛpɪˈθiːlɪəm) n, pl -liums or -lia ( -lɪə) (Anatomy) an animal tissue consisting of one or more layers of closely packed cells covering the external and internal surfaces of the body. It consists of cells joined by small amounts of cementing substances. Epithelium is classified into types on the basis of the number of layers deep and the shape of the superficial cells. Epithelium consisting of cube-shaped or prismatic cells with height about equal to their width. (in plants) a layer of cells lining cavities and secretory canals, for example, resin canals. Synonym: The nonkeratinized epithelium that lines the gingival sulcus. They are devoid of blood vessels. Meaning and definition of epithelium: The layer of cells covering internal and external surfaces of the body. “Epithelium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epithelium. Epithelium is composed of one or more layers of densely packed cells. For the term epithelium may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for medical and legal or special purposes. The key actions produced by the initial injury and wound, When someone takes a big sniff, molecules travel up the nose to the olfactory, The first requirement for limb regeneration is the presence of a wound, and formation of wound, The additional claim that swabbing leads to damage in the olfactory, Because olfactory symptoms can occur very early in the disease, before respiratory symptoms, this may make understanding the virus’ entry into cells in the olfactory sensory, Post the Definition of epithelium to Facebook, Share the Definition of epithelium on Twitter. Their nuclei lie at different levels, giving the appearance of stratification. 'All Intensive Purposes' or 'All Intents and Purposes'? Membranous tissue composed of one or more layers of cells separated by very little intercellular substance and forming the covering of most internal and external surfaces of the body and its organs. The epithelium may be simple, consisting of a single layer, or stratified, consisting of several layers. By contrast the endothelium is the layer of cells lining the closed internal spaces of the body such as the blood vessels and Stratified squamous epithelium may be keratinized for a protective function or abnormally keratinized in pathological response. liums. GLANDULAR EPITHELIUM: (Orig. This type of tissue is found only in the urinary system (renal pelvis, ureter, bladder, and a part of the urethra). Britannica English: Translation of epithelium for Arabic Speakers, Britannica.com: Encyclopedia article about epithelium. The epithelium may include goblet cells, which secrete mucus. Epithelium consisting of secretory cells.
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