membranes Definition

a thin soft pliable sheet or layer especially of animal or plant origin

a piece of parchment forming part of a roll

a thin membranous layer of connective tissue that separates a layer of epithelial cells from the underlying lamina propia

a membrane extending from the bony shelf of the cochlea to the outer wall and supporting the organ of Corti

a membrane of a cell; especially : plasma membrane

a structure (such as the amnion) that derives from the fertilized ovum but does not form a part of the embryo

a resistant membranous layer in eggs of many animals that forms following fertilization by the thickening and separation of the vitelline membrane from the cell surface and that prevents multiple fertilization

a membrane rich in mucous glands; specifically : one that lines body cavities and passages (as of the gastrointestinal or respiratory tract) which communicate directly or indirectly with the outside of the body : mucosa

a thin membrane found in many vertebrates at the inner angle or beneath the lower lid of the eye and capable of extending across the eyeball

a double membrane enclosing a cell nucleus and having its outer part continuous with the endoplasmic reticulum —called also nuclear envelope

the fibrous connective-tissue layer covering the cementum of a tooth and holding it in place in the jawbone