User Tools

Site Tools


glossary:membrane

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

glossary:membrane [2012/10/16 14:40] (current)
Line 1: Line 1:
 +(1) A thin layer of [[tissue]] which covers a surface, lines a cavity or divides a space or organ. ​
 +A pliable sheet of tissue that covers or lines or connects organs or [[cell]]s of animals. ​
 +A thin layer of tissue, such as the [[plasma]] membrane on the outer layer of cells. ​
  
 +(2) A membrane is a very thin envelope that surrounds and protects a [[cell]]. It controls the exchanges between the cell and the exterior environment:​ the membrane allows the passage of certain substances and prevents the passage of others. The small structures within the cell (the organelles) are also enclosed by membranes.
 +
 +(3) A thin, flexible layer of tissue that covers, lines, separates, or connects cells or parts of an organism. Membranes are usually made of layers of phospholipids containing suspended [[protein]] molecules and are permeable to water and fat-soluble substances.
 +
 +**cell membrane** - The thin membrane that forms the outer surface of the protoplasm of a cell and regulates the passage of materials in and out of the [[cell]]. It is made up of [[protein]]s and lipids and often contains molecular receptors. The membranes of organelles within the cell are made of the same basic material as the cell membrane. In plant cells, the cell membrane is surrounded by a rigid cell wall. Also called [[plasma]] membrane
 +
 +**trophoblast** - the membrane that forms the wall of the blastocyst in early development;​ aids implantation in the uterine wall; "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"​
 +
 +**chorioallantoic membrane, chorioallantois** - the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
 +
 +**web** - membrane connecting the toes of some aquatic birds and mammals
 +
 +**Bowman'​s capsule, capsula glomeruli, glomerular capsule** - thin double membrane surrounding the glomerulus of a nephron
 +
 +**axolemma** - outer membrane covering an axon
 +
 +**basilar membrane** - a membrane in the cochlea that supports the organ of Corti
 +
 +**fetal membrane** - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
 +
 +**choroid, choroid coat** - a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye
 +
 +**ciliary body** - the part of the tunic of the eye between the choroid coat and the iris; "the ciliary body produces aqueous humor"
 +
 +**cornea** - the transparent dome-shaped anterior portion of the outer covering of the eye; it covers the iris and pupil and is continuous with the sclera
 +
 +**diaphragm,​ midriff** - (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
 +
 +**eardrum, myringa, tympanic membrane, tympanum** - the membrane in the ear that vibrates to sound
 +
 +**endocranium** - membrane lining the inside of the skull
 +
 +**endosteum** - vascular membrane that lines the inner surface of long bones
 +
 +**ependyma** - thin epithelial membrane lining the ventricles of the brain and the spinal cord canal
 +
 +**fertilization membrane** - the membrane that forms around a fertilized ovum and prevents penetration by additional spermatozoon
 +
 +**hyaloid, hyaloid membrane** - the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina
 +
 +**intima** - the innermost membrane of an organ (especially the inner lining of an [[artery]] or [[vein]] or [[lymphatic vessel]])
 +
 +**iris** - muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye
 +
 +**lamella** - a thin membrane that is one of the calcified layers that form bones
 +
 +**meninges, meninx** - a membrane (one of 3) that envelops the brain and spinal cord
 +
 +**mucosa, mucous membrane** - mucus-secreting membrane lining all body cavities or passages that communicate with the exterior
 +
 +**periosteum** - a dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles; contains nerves and blood vessels that nourish the enclosed bone
 +
 +**perithelium** - tissue layer around small blood vessels
 +
 +**retina** - the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
 +
 +**sarcolemma** - an extensible membrane enclosing the contractile substance of a muscle fiber
 +
 +**semipermeable membrane** - a membrane (as a cell membrane) that allows some molecules to pass through but not others
 +
 +**serosa, serous membrane** - a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid
 +
 +**synovial membrane, synovium** - a thin membrane in synovial (freely moving) joints that lines the joint capsule and secretes synovial fluid
 +
 +adventitia, tunic, tunica - an enveloping or covering membrane or layer of body tissue
 +
 +phospholipid - any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes
glossary/membrane.txt ยท Last modified: 2012/10/16 14:40 (external edit)