has part in taxon Chordata mucosa A lining of mostly endodermal origin, covered in epithelium, which is involved in absorption and secretion. They line various body cavities that are exposed to the external environment and internal organs. It is at several places continuous with skin: at the nostrils, the lips, the ears, the genital area, and the anus. The sticky, thick fluid secreted by the mucous membranes and gland is termed mucus. The term mucous membrane refers to where they are found in the body and not every mucous membrane secretes mucus[WP]. mucous membrane SCTID:361693009 NCIT:C13166 AEO:0000199 MESH:D009092 EV:0100382 region of mucosa CALOHA:TS-2031 tunica mucosa BTO:0000886 galen:Mucosa FMA:85355 FMA:85358 GAID:297 mucosal region mucosa of organ mucosa of organ part organ mucosa EHDAA2_RETIRED:0003234 Wikipedia:Mucous_membrane epithelium connective tissue organ component layer