Valve (redirected from Houston's valves)

valve (valv) a membranous fold in a canal or passage that prevents backward flow of material passing through it.

Valves of the heart.

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aortic valve  that guarding the entrance to the aorta from the left ventricle.

artificial cardiac valve  a substitute, mechanical or composed of tissue, for a cardiac valve.

atrioventricular valves  the valves between the right atrium and right ventricle (tricuspid v. ) and the left atrium and left ventricle (mitral v. ).

Béraud's valve  a fold of mucous membrane sometimes occurring at the beginning of the nasolacrimal duct.

bicuspid valve  mitral v.

bileaflet valve  a heart valve prosthesis consisting of a circular sewing ring to which are attached two semicircular occluding disks that swing open and closed to regulate blood flow.

bioprosthetic valve  an artificial cardiac valve composed of biological tissue, usually porcine.

caged-ball valve  a heart valve prosthesis comprising a sewing ring attached to a cage composed of curved struts that contains a free-floating ball.

cardiac valves  those controlling the flow of blood through and from the heart.

coronary valve  that at the entrance of the coronary sinus into the right atrium.

flail mitral valve  a cardiac valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the blood stream.

Houston's valves  permanent transverse folds, usually numbering three, in the rectum.

ileocecal valve , ileocolic valve that guarding the opening between the ileum and cecum.

mitral valve  that between the left atrium and left ventricle, usually having two cusps (anterior and posterior).

pulmonary valve  that at the entrance of the pulmonary trunk from the right ventricle.

pyloric valve  a prominent fold of mucous membrane at the pyloric orifice of the stomach.

semilunar valve  one having semilunar cusps, i.e., the aortic and pulmonary valves; sometimes used to designate the semilunar cusps composing these valves.

thebesian valve  coronary v.

tilting-disk valve  a heart valve prosthesis consisting of a sewing ring and a valve housing containing a suspended disk that swings between open and closed positions.

tricuspid valve  that guarding the opening between the right atrium and right ventricle.

ureteral valve  a congenital transverse fold across the lumen of the ureter, composed of redundant mucosa made prominent by circular muscle fibers; it usually disappears in time but may rarely cause urinary obstruction.

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valve (vlv)

n.

1. A membranous structure in a hollow organ or passage, as in an artery or vein, that folds or closes to prevent the return flow of the body fluid passing through it.

2. Any of various devices that regulate the flow of gases, liquids, or loose materials through piping or through apertures by opening, closing, or obstructing ports or passageways.

3. The movable control element of such a device.

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Valve

Tissue in the passageways between the heart's upper and lower chambers that controls passage of blood and prevents regurgitation.

Mentioned in: Balloon Valvuloplasty, Pulmonary Valve Stenosis

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valve,

n a structure that controls flow of the contents of a canal or passage.

valve, exhalation,

n a valve that permits escape of exhaled gases into the atmosphere and prevents them from being rebreathed.

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valve

1. a membranous fold in a canal or passage that prevents backward flow of material passing through it.

2. a mechanical device to regulate the flow of liquid or gas from an area of higher pressure to one of lower pressure.

3. automatic valve which maintains a steady vacuum in the system of a mechanical milking machine.

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Adam's pressure reducing valve

see reducing valve (below).

aortic valve

see aortic valve.

atrioventricular v's

the valves between the right atrium and right ventricle (tricuspid valve) and the left atrium and left ventricle (mitral valve).

bicuspid valve

mitral valve.

cardiac v's

valves that control flow of blood through and from the heart. See also aortic valve, mitral valve, pulmonary valve, tricuspid valve.

coronary valve

a valve at entrance of the coronary sinus into right atrium.

flair valve

a cardiac valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the bloodstream.

ileocecal valve, ileocolic valve

see ileocecal valve.

nonreturn valve

in anesthetic circuits, it prevents exhaled gas from returning to the patient.

portal valve

regulates the amount of venous blood entering the kidney.

pressure reducing valve

see reducing valve (below).

pyloric valve

a prominent fold of mucous membrane at the pyloric orifice of the stomach.

reducing valve

a special valve used on anesthetic machines and which reduces the pressure of the gas reaching the exit valve so that control of the flow is made easier. Called also regulator.

semilunar v's

valves made up of semilunar segments or cusps (valvulae semilunares), guarding the entrances into the aorta and pulmonary artery.

thebesian valve

coronary valve.

valve tube

a thermionic diode that permits the flow of electric current in an x-ray machine in only one direction.