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Jacob's membrane | Membrane \Mem"brane\, n. [F., fr. L. membrana the skin that covers the separate members of the body, fr. L. membrum. See {Member}.] (Anat.) A thin layer or fold of tissue, usually supported by a fibrous network, serving to cover or line some part or organ, and often secreting or absorbing certain fluids. [1913 Webster] Note: The term is also often applied to the thin, expanded parts, of various texture, both in animals and vegetables. [1913 Webster] {Adventitious membrane}, a membrane connecting parts not usually connected, or of a different texture from the ordinary connection; as, the membrane of a cicatrix. {Jacob's membrane}. See under {Retina}. {Mucous membranes} (Anat.), the membranes lining passages and cavities which communicate with the exterior, as well as ducts and receptacles of secretion, and habitually secreting mucus. {Schneiderian membrane}. (Anat.) See {Schneiderian}. {Serous membranes} (Anat.), the membranes, like the peritoneum and pleura, which line, or lie in, cavities having no obvious outlet, and secrete a serous fluid. [1913 Webster] |
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