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membrane British & World English

A pliable sheet-like structure acting as a boundary, lining, or partition in an organism

cell membrane British & World English

The semipermeable membrane surrounding the cytoplasm of a cell

unit membrane British & World English

A lipoprotein membrane which encloses many cells and cell organelles and is composed of two electron-dense layers enclosing a less dense layer

mucous membrane British & World English

An epithelial tissue which secretes mucus, and lines many body cavities and tubular organs including the gut and respiratory passages

plasma membrane British & World English

A microscopic membrane of lipids and proteins which forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and regulates the passage of molecules in and out of the cytoplasm

serous membrane British & World English

A mesothelial tissue which lines certain internal cavities of the body, forming a smooth, transparent, two-layered membrane lubricated by a fluid derived from serum. The peritoneum, pericardium, and pleura are serous membranes

basement membrane British & World English

A thin, delicate membrane of protein fibres and mucopolysaccharides separating an epithelium from underlying tissue

basilar membrane British & World English

A membrane in the cochlea that bears the organ of Corti

hyaloid membrane British & World English

A thin transparent membrane enveloping the vitreous humour of the eye

tympanic membrane British & World English

A membrane forming part of the organ of hearing, which vibrates in response to sound waves. In humans and other higher vertebrates it forms the eardrum, between the outer and middle ear

vitelline membrane British & World English

A transparent membrane surrounding and secreted by the fertilized ovum, preventing the entry of further spermatozoa

nictitating membrane British & World English

A whitish or translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals. It can be drawn across the eye to protect it from dust and keep it moist

hyaline membrane disease British & World English

A condition in newborn babies in which the lungs are deficient in surfactant, which prevents their proper expansion and causes the formation of hyaline material in the lung spaces

arachnoid membrane in arachnoid British & World English

A fine, delicate membrane, the middle one of the three membranes or meninges that surround the brain and spinal cord, situated between the dura mater and the pia mater


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