A pliable sheet-like structure acting as a boundary, lining, or partition in an organism
Bone, or a bone, that develops within a sheet of mesenchymal tissue without prior formation of a cartilaginous primordium.
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.
The semipermeable membrane surrounding the cytoplasm of a cell
A lipoprotein membrane which encloses many cells and cell organelles and is composed of two electron-dense layers enclosing a less dense layer
A sheet or film of a polymer (originally collodion) that has pores of a uniform size, used especially for ultrafiltration.
A keypad in which the keys are membrane switches rather than push-buttons.
A touch-sensitive switch in which an electrical circuit is made between two contacts by depressing a flexible covering membrane of electrically resistive material.
A membrane containing photoactive pigments which is produced under certain conditions in the archaebacterium Halobacterium salinarium.
An epithelial tissue which secretes mucus, and lines many body cavities and tubular organs including the gut and respiratory passages
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
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
Anatomy (now rare) = adipose tissue; compare cellular membrane.
Loose connective tissue (in early use especially adipose tissue) (now disused).
= blastoderm (now rare).
Anatomy. A membrane lining a part of the body, especially a mucous membrane or endothelium. Now rare.
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.
A transient membrane covering the crown of a newly erupted tooth; the primary enamel cuticle.
= nictitating membrane.
= nuclear envelope.
A sheet of fibrous tissue that occupies most of the obturator foramen.
The membrane overlying the macula of the utricle, saccule, or lagena.
(Now rare) a mucous membrane, especially the olfactory membrane of the nasal cavities.
The vestibular membrane, which separates the cochlear duct and the vestibular canal in the labyrinth of the inner ear.
A thin, delicate membrane of protein fibres and mucopolysaccharides separating an epithelium from underlying tissue
A membrane in the cochlea that bears the organ of Corti
A thin transparent membrane enveloping the vitreous humour of the eye
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
A transparent membrane surrounding and secreted by the fertilized ovum, preventing the entry of further spermatozoa
Any of the thin, flexible areas of the cuticle of an arthropod located between the segments of the body and limbs.
A membrane of biological origin; especially that surrounding a cell or organelle and consisting chiefly of a lipid bilayer.
Filtration by means of a membrane filter.
The periodontal ligament.
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
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
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
Adapted for winking or blinking; nictitating. Also (occasionally): giving the appearance of winking or blinking.