mucous membrane

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Related to Mucosal tissue: Mucous lining

mucous membrane

a mucus-secreting membrane that lines body cavities or passages that are open to the external environment

Mucous Membrane

 

(also mucosa), a membrane 0.5–4 mm thick that lines the inner surfaces of the digestive and respiratory organs, the urogenital system, the accessory sinuses of the nose, the middle ear, and the excretory ducts of glands. The name “mucous membrane” is derived from mucus, a glandular secretion that keeps the surfaces of mucous membranes moist.

A mucous membrane consists of one or more epithelial layers, a connective-tissue layer, a muscle plate formed by smooth muscle cells, and a tunica submucosa. The tunica submucosa, which is on the external side of the muscle plate, consists of a flexible layer of areolar tissue that separates the mucous membrane from the tissues underneath. Depending on the functions of the particular organ, mucosal epithelium may be multilay-ered and flat or monolayered and cylindrical, prismatic, cubical, or ciliated (in the airways). Its surface may be smooth, plicate, or villous; for example, in the small intestine the mucous membrane forms folds, villi, and crypts.

Located in the mucous membrane and tunica submucosa are glands, terminal nerve branches, blood and lymphatic vessels, and masses of lymphoid tissue, for example, follicles and tonsils. Mucous glands may be unicellular or multicellular. Unicellular mucous glands consist of goblet cells located between surface epithelial cells. Multicellular mucous glands may be simple tubular or alveolar glands, which are found in the stomach and small intestine, or complex mucous glands, which are found in the digestive tract and the airways.

V. V. KUPRIIANOV

mucous membrane

[′myü·kəs ′mem‚brān]
(histology)
The type of membrane lining cavities and canals which have communication with air; it is kept moist by glandular secretions. Also known as tunica mucosa.
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The most common levels of intensity of PLUNC protein expression were + in the nasal polyp samples, +++ in the chronic sinusitis samples, and ++ in the normal nasal mucosal tissue (figure, table 1).
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APS is developing proprietary proteins that help with the growth of the mucosal tissue, thereby preventing the onset of mucositis.
Mucosal tissue is often the point of entry for invading pathogens, and has long been considered an effective site for inducing immunity to foreign invaders.
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at this exciting time, following the recently announced partnership with Jansen, a division of Johnson & Johnson, which will enable the company to exploit its unique delivery technology for inducing protein expression in mucosal tissues, and advancing enGene's own products into clinical trials involving patients with significant unmet needs, " said Dennis H.
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One of the advantages of this approach, Desai said, is that it may be applicable for delivering drugs to other part of the body as well, such as mucosal tissues like the insides of the nose, lungs, or vagina, where the surface cells are also coated with such cilia.