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membrane British & World English

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

membrane bone British & World English

Bone, or a bone, that develops within a sheet of mesenchymal tissue without prior formation of a cartilaginous primordium.

pit membrane British & World English

The relatively thin area of primary cell wall and middle lamella at the base of a pit, especially when this forms the common partition between the opposed pits of a pit pair.

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

membrane filter British & World English

A sheet or film of a polymer (originally collodion) that has pores of a uniform size, used especially for ultrafiltration.

membrane keypad British & World English

A keypad in which the keys are membrane switches rather than push-buttons.

membrane switch British & World English

A touch-sensitive switch in which an electrical circuit is made between two contacts by depressing a flexible covering membrane of electrically resistive material.

purple membrane British & World English

A membrane containing photoactive pigments which is produced under certain conditions in the archaebacterium Halobacterium salinarium.

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

adipose membrane British & World English

Anatomy (now rare) = adipose tissue; compare cellular membrane.

cellular membrane British & World English

Loose connective tissue (in early use especially adipose tissue) (now disused).

germinal membrane British & World English

= blastoderm (now rare).

internal membrane British & World English

Anatomy. A membrane lining a part of the body, especially a mucous membrane or endothelium. Now rare.

membrane potential British & World English

A voltage difference across a cell membrane or other semipermeable biological or synthetic membrane, resulting from an unequal distribution of diffusible ions on either side of the membrane.

Nasmyth's membrane British & World English

A transient membrane covering the crown of a newly erupted tooth; the primary enamel cuticle.

nictating membrane British & World English

= nictitating membrane.

obturator membrane British & World English

A sheet of fibrous tissue that occupies most of the obturator foramen.

otolithic membrane British & World English

The membrane overlying the macula of the utricle, saccule, or lagena.

pituitary membrane British & World English

(Now rare) a mucous membrane, especially the olfactory membrane of the nasal cavities.

Reissner's membrane British & World English

The vestibular membrane, which separates the cochlear duct and the vestibular canal in the labyrinth of the inner ear.

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

arthrodial membrane British & World English

Any of the thin, flexible areas of the cuticle of an arthropod located between the segments of the body and limbs.

biological membrane British & World English

A membrane of biological origin; especially that surrounding a cell or organelle and consisting chiefly of a lipid bilayer.

membrane filtration British & World English

Filtration by means of a membrane filter.

periodontal membrane British & World English

The periodontal ligament.

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

nictitant membrane in nictitant British & World English

Adapted for winking or blinking; nictitating. Also (occasionally): giving the appearance of winking or blinking.

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