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membrane /mem·brane/ (mem´brān) a thin layer of tissue that covers a surface, lines a cavity, or divides a space or organ.
alveolar-capillary membrane , alveolocapillary membrane a thin tissue barrier through which gases are exchanged between the alveolar air and the blood in the pulmonary capillaries. Called also blood-air barrier andblood-gas barrier.
alveolodental membrane periodontium.
arachnoid membrane arachnoid (2).
atlantooccipital membrane either of two midline ligamentous structures, one (the anterior ) passing from the anterior arch of the atlas to the anterior margin of the foramen magnum, and the other (the posterior ) connecting the posterior aspects of the same structures.
basement membrane a sheet of amorphous extracellular material upon which the basal surfaces of epithelial cells rest; it is also associated with muscle cells, Schwann cells, fat cells, and capillaries, interposed between the cellular elements and the underlying connective layer.
basilar membrane of cochlear duct lamina basilaris.
Bichat's membrane fenestrated m.
Bowman's membrane a thin layer of cornea between the outer layer of stratified epithelium and the substantia propria.
Bruch's membrane the inner layer of the choroid, separating it from the pigmentary layer of the retina.
Brunn's membrane the epithelium of the olfactory region of the nose.
cloacal membrane the thin temporary barrier between the embryonic hindgut and the exterior.
Corti's membrane a gelatinous mass resting on the organ of Corti, connected with the hairs of the hair cells.
croupous membrane the false membrane of true croup.
cytoplasmic membrane plasma m.
decidual membranes , deciduous membranes decidua.
Descemet's membrane a thin hyaline membrane between the substantia propria and endothelial layer of the cornea.
diphtheritic membrane a false membrane characteristic of diphtheria, formed by coagulation necrosis.
drum membrane tympanic m.
elastic membrane one made up largely of elastic fibers.
enamel membrane
epiretinal membrane a pathologic membrane partially covering the surface of the retina, probably originating chiefly from the retinal pigment epithelial and glial cells.
extraembryonic membranes those that protect the embryo or fetus and provide for its nutrition, respiration, and excretion; the yolk sac (umbilical vesicle), allantois, amnion, chorion, decidua, and placenta.
false membrane neomembrane; a membranous exudate, such as the diphtheritic membrane.
fenestrated membrane one of the perforated elastic sheets of the tunica intima and tunica media of arteries.
fetal membranes extraembryonic m's.
fibroelastic membrane of larynx the fibroelastic layer beneath the mucous coat of the larynx.
germinal membrane blastoderm.
glomerular membrane the membrane covering a glomerular capillary.
hemodialyzer membrane the semipermeable membrane that filters the blood in a hemodialyzer, commonly made of cuprophane, cellulose acetate, polyacrylonitrile, or polymethyl methacrylate.
hyaline membrane
1. dental cuticle.
2. the inner layer of cells within the enamel organ of the fetal dental germ.
1. a membrane between the outer root sheath and inner fibrous layer of a hair follicle.
2. a layer of eosinophilic hyaline material lining alveoli, alveolar ducts, and bronchioles, found at autopsy in infants who have died of respiratory distress syndrome of the newborn.
Basement membrane, comprising the basal lamina and reticular lamina, in a diagram of a section through epithelial tissue.
hyaloid membrane vitreous m. (1).
Jackson's membrane a web of adhesions sometimes covering the cecum and causing obstruction of the bowel.
keratogenous membrane matrix unguis.
limiting membrane one which constitutes the border of some tissue or structure.
medullary membrane endosteum.
mucous membrane the membrane lining various canals and cavities of the body.
Nasmyth's membrane dental cuticle.
nuclear membrane
olfactory membrane the olfactory portion of the mucous membrane lining the nasal fossa.
ovular membrane vitelline m.
peridental membrane , periodontal membrane periodontal ligament.
placental membrane the membrane separating the fetal from the maternal blood in the placenta; sometimes inappropriately called the placental barrier.
plasma membrane the structure, composed of lipids, proteins, and some carbohydrates, that encloses the cytoplasm of a cell, forming a selectively permeable barrier.
pupillary membrane a mesodermal layer attached to the rim or front of the iris during embryonic development.
Reissner's membrane the thin anterior wall of the cochlear duct, separating it from the scala vestibuli.
reticular membrane , reticulated membrane a netlike membrane over the spiral organ of the ear, through which pass the free ends of the outer hair cells.
membrane of round window secondary tympanic m.
Ruysch's membrane , ruyschian membrane lamina choroidocapillaris.
Scarpa's membrane secondary tympanic m.
schneiderian membrane the mucous membrane lining the nose.
secondary tympanic membrane the membrane enclosing the fenestra cochlearis.
serous membrane tunica serosa.
Shrapnell's membrane the thin upper part of the tympanic membrane.
suprapleural membrane the strengthened portion of the endothoracic fascia attached to the inner part of the first rib and the transverse process of the seventh cervical vertebra.
synaptic membrane the part of the plasma membrane of a neuron that is within a synapse.
synovial membrane
1. either of the membranes, inner and outer, comprising the nuclear envelope.
2. nuclear envelope.
1. the inner of the two layers of the articular capsule of a synovial joint, composed of loose connective tissue and having a free smooth surface that lines the joint cavity.
2. either of two membranes, superior and inferior, lining the articular capsule of the temporomandibular joint.
Placental membrane separating the blood in the fetal capillaries from the maternal blood in the intervillous space. (A), chorionic villus containing the fetal vessels and surrounded by maternal blood in the intervillous space; (B), cross-section through a villus, showing the layers of the placental membrane separating the fetal blood from the maternal blood surrounding the villus.
tectorial membrane Corti's m.
tympanic membrane the thin partition between the external acoustic meatus and the middle ear.
undulating membrane a protoplasmic membrane running like a fin along the bodies of certain protozoa.
unit membrane the trilaminar structure of the plasma membrane and other cellular membranes (e.g., nuclear m's, mitochondrial m's) revealed by the electron microscope.
vestibular membrane of cochlear duct the thin anterior wall of the cochlear duct, separating it from the scala tympani.
vitelline membrane the cytoplasmic, noncellular membrane surrounding an oocyte.
vitreous membrane
yolk membrane vitelline m.
Zinn's membrane ciliary zonule.
Dorland's Medical Dictionary for Health Consumers. © 2007 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Tympanic membrane (membrana tympanica).
mem·brane (m
mbrn)
n.
1. A thin pliable layer of tissue covering surfaces, enveloping a part, lining a cavity, or separating or connecting structures or organs.
2. Cell membrane.
3. A thin sheet of natural or synthetic material that is permeable to substances in solution.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
membrane
[mem′brān]
Etymology: L, membrana, thin skin
a thin layer of tissue composed of epithelial cells and connective tissue that covers a surface, lines a cavity, or divides a space in the body. The principal kinds of membranes are mucous membrane, serous membrane,skin, and synovial membrane.
Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.
membrane,
n a thin layer of tissue that covers a surface or divides a space or organ.
membrane, barrier,
membrane, basement,
membrane bone,
membrane, collagen,
n small pieces of meshlike material inserted between the gingival tissue flap and underlying bone, primarily during flap surgery. It is used to prevent grafted material from moving and to stop harmful cells from growing. It can be used alone or in combination with bone grafting.
n the delicate, PAS-positive, noncellular membrane on which the epithelium is seated.
n See bone, membrane.
n a bioabsorbable, semipermeable membrane made of collagen. It is hemostatic, chemotactic, and well tolerated by adjacent tissue.
(in´tr
mem´brnus), n formed by differentiation of mesenchymal cells into osteoblasts and bone matrix. See also bone, membrane and bone, membrane, formation.
membrane, mucous,
membrane, Nasmyth's,
membrane, occlusive,
rin´jēl), n a layer of tissue on the cephalic end of the embryo in the region where the oral cavity will later be formed. Previously called
buccopharyngeal membrane. See also oropharynx.
membrane, periodontal,
membrane, subimplant,
Mosby's Dental Dictionary, 2nd edition. © 2008 Elsevier, Inc. All rights reserved.
membrane
a thin layer of tissue that covers a surface, lines a cavity, or divides a space or organ.
alveolocapillary membrane
membrane-attack complex
basilar membrane
Bowman's membrane
Bruch's membrane
membrane carrier
cell membrane
membrane channels
continuous membrane
cricothyroid membrane
Descemet's membrane
drum membrane
extraembryonic m's
extravitelline membrane
false membrane
fenestrated membrane
fetal m's
fibrous membrane
Henle's membrane
hyaline membrane
n See ligament, periodontal.
n the fibrous connective tissue that regenerates from the periosteum and that forms between the inner surface of the implant framework and the bone surface.
a thin tissue barrier through which gases are exchanged between the alveolar air and the blood in the pulmonary capillaries.
complement components C5-C9 which form in terminal stage of either of the complement pathways and lead to cell lysis.
the lower boundary of the scala media of the ear.
a thin layer of basement membrane between the outer layer of stratified epithelium and the substantia propria of the cornea.
the inner layer of the choroid, separating it from the pigmented layer of the retina.
a mechanism in the cell membrane of epithelial cells in the intestinal mucosa which facilitates the rapid transport of for example glucose, into the cell and thus into the bloodstream.
plasma membrane (below).
see channel.
the middle of the three membranes on the outside of the yolk of the hen egg.
the membrane connecting the thyroid cartilage to the cricoid cartilage. It is extensive in the horse and surgical incision through it allows access to the interior of the larynx.
the posterior lining membrane of the cornea; it is a thin hyaline membrane between the substantia propria and the endothelial layer of the cornea.
tympanic membrane (below).
those that protect the embryo or fetus and provide for its nutrition, respiration and excretion; the yolk sac (umbilical vesicle), allantois, amnion, chorion, decidua and placenta.
the outermost of the three membranes on the outside of the yolk of the hen egg.
a membrane similar to the pseudomembrane; fibrinous exudates readily loosened from underlying tissue, as in croupous or pseudomembranous inflammation.
one of the perforated elastic sheets of the tunica intima and tunica media of arteries.
see fetal membranes. See also extraembryonic membranes (above).
the strong, fibrous support layer in a joint capsule.
see henle's membrane.
1. a membrane between the outer root sheath and inner fibrous layer of a hair follicle.
3. a homogeneous eosinophilic membrane lining alveolar ducts and alveoli, frequently found at necropsy in premature human infants. See also hyaline membrane disease.
hyoglossal membrane
interosseous membrane
limiting membrane
mucous membrane
nictitating membrane
nuclear membrane
olfactory membrane
periodontal membrane
perivitelline membrane
placental membrane
plasma membrane
a fibrous lamina connecting the under-surface of the tongue with the hyoid bone.
the membrane connecting the shaft of the fibula to the tibia.
one that constitutes the border of some tissue or structure.
the membrane covered with epithelium that lines many tubular organs of the body.
see membrana nictitans.
1. either of the membranes, inner and outer, comprising the nuclear envelope.
2. nuclear envelope.
the olfactory portion of the mucous membrane lining the nasal fossa.
see periodontium.
the innermost of the three layers on the outside of the yolk in the hen egg.
the membrane that separates the fetal from the maternal blood in the placenta.
the membrane that encloses a cell; it is composed of phospholipids, glycolipids, cholesterol and proteins. The primary structure is a lipid bilayer. Phospholipid molecules have an electrically charged 'head' that attracts water and a hydrocarbon 'tail' that repels water; they line up side by side in two opposing layers, with their heads on the inner or outer surface of the membrane and their tails in the core, from which water is excluded. The other lipids affect the structural properties of the membrane. Proteins embedded in the membrane transport specific molecules across the membrane, act as hormone receptors, or perform other functions.
membrane potential
of a cell is the voltage difference across the cell membrane resulting from the differential concentrations of sodium and potassium on either side of the membrane. The resting potential, for example in a nerve cell, is altered by the temporary opening of the sodium channels in the membrane during an action potential, allowing a redistribution of the ions.
membrane proteins
the large number of proteins attached to a cell membrane. They include integral proteins, called also intrinsic, which are embedded in the phospholipid bi-layer of the cell membrane, and peripheral proteins, called also extrinsic, because they are loosely bound and can readily be extracted without damage to the cell membrane.
pupillary membrane
Reissner's membrane
Scarpa's membrane
semipermeable membrane
serosal membrane
serous membrane
shell membrane
synovial membrane
membrane transport
unit membrane
a vascular membrane which occupies the pupil in the embryo stage, completely covering the anterior surface of the lens but subsequently disappears. See also persistent pupillary membrane.
the thin anterior wall of the cochlear duct, separating it from the scala vestibuli.
tympanic membrane, secondary.
one permitting passage through it of some but not all substances.
see serous membrane (below).
the membrane lining the walls of the body cavities and enclosing the contained organs; it consists of mesothelium lying upon a connective tissue layer and it secretes a watery fluid.
the membrane on the outside of the soft contents of the hen egg and just inside the shell. It consists of two membranes close together, with an air cell in between.
see synovial membrane.
transport of electrolytes across semipermeable membranes with the aid of a transporter.
the trilaminar structure of all cellular membranes (such as the plasma membrane, nuclear membranes, mitochondrial membranes, endoplasmic reticulum, lysosomes) as they appear in electron micrographs. The biochemical structure is a lipid bilayer.
wing membrane
yolk membrane
Saunders Comprehensive Veterinary Dictionary, 3 ed. © 2007 Elsevier, Inc. All rights reserved
membrane
A very thin layer of tissue covering a surface, lining a body cavity, or dividing a space or organ
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
Patient discussion about membrane.
Q. For those that had an epimacular membrane removed, how long was it before your eye healed?How was your vision afterwards? Do you now require or benefit from glasses?
Q. HYALINE MEMBRANE DISEASE in pre-mature infants;what are the causes of it in pregnant women?
A. Epimacular membrane removal can be associated with a variety of ocular conditions and therefore the healing process varies tremendously depending on the underlying pathology. Furthermore, this condition may recur.
the membrane comprising the wing of the bat.
the membrane investing the yolk of the hen egg; it includes (from the inside out) the perivitelline, the continuous and the extravitelline membranes.
A. the cause of Hyaline Membrane disease is pre-mature birth. while the fetus develop, about in the 29th week a substance called surfactant is created in the lungs. this substance's function is to change the surface tension of the fluid in the lungs- therefore decreasing it's force. the surface tension tends to shrink the lungs and can cause the lungs to collapse. so a premature baby wouldn't be able to breath properly.
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