A pliable sheetlike structure acting as a boundary, lining, or partition in an organism
the sensitive membranes in the mouth
The semipermeable membrane surrounding the cytoplasm of a cell
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.
A lipoprotein membrane that 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.
An epithelial tissue that secretes mucus and that lines many body cavities and tubular organs including the gut and respiratory passages
A microscopic membrane of lipids and proteins that forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and that regulates the passage of molecules in and out of the cytoplasm
A membrane containing photoactive pigments which is produced under certain conditions in the archaebacterium Halobacterium salinarium.
A mesothelial tissue that 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.
A thin, delicate membrane of protein fibers and glycosaminoglycans separating an epithelium from underlying tissue
A membrane in the cochlea that bears the organ of Corti
Loose connective tissue (in early use especially adipose tissue) (now disused).
= blastoderm (now rare).
A thin transparent membrane enveloping the vitreous humor of the eye
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 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.
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
The periodontal ligament.
A condition in newborn babies in which the lungs are deficient in surfactant, preventing their proper expansion and causing the formation of hyaline material in the lung spaces
Like a spider or arachnid
Adapted for winking or blinking; nictitating. Also (occasionally): giving the appearance of winking or blinking.