Mucous membrane (mucosa)

**Mucosal tissue** refers to moist layers of epithelial cells lining many body cavities and organs exposed to the external environment (e.g., digestive tract, respiratory tract, genitourinary tract)[1][4][7][9]. These membranes serve as the **primary barrier** between the body's interior and the outside world, help maintain hydration, provide immune defense, and support nutrient absorption[2][5][10]. Mucosa contains epithelial cells, connective tissue (lamina propria), and sometimes muscularis mucosae, as well as embedded glands that secrete mucus. Specialized mucosal immune tissues sample antigens, regulate tolerance to commensals and food antigens, and react to pathogens, forming a major pillar of immune surveillance[2][8][10]. Diseases affecting mucosal tissue include inflammation (e.g., ulcerative colitis), cancer (e.g., mucosal melanoma), and a variety of infectious and autoimmune conditions[6]. **Summary:** "Mucosal tissue" is a descriptive category of protective tissue, not a molecular or receptor target. Queries about therapeutic targeting should reference specific molecular entities (e.g., mucin proteins, cell-surface receptors, enzymes) within mucosal tissue. If your intent was to identify a molecule or receptor in mucosal tissue, please clarify which specific target you are interested in.

Other names

mucosamucous membrane