valva


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valve

 [valv]
a membranous fold in a canal or passage that prevents backward flow of material passing through it.
aortic valve a semilunar valve that separates the left ventricle and the aorta; it opens with end diastole, causing the second heart sound.
atrioventricular v's the cardiac valves between the right atrium and right ventricle (tricuspid valve) and the left atrium and left ventricle (mitral valve).
bicuspid valve mitral valve.
bicuspid aortic valve a congenital anomaly of the aortic valve, caused by incomplete separation of two of the three cusps; it is generally asymptomatic early in life but is predisposed to calcification and stenosis later on.
Braschi valve a one-way valve put into the inspiratory limb of a ventilator circuit in order to measure the intrinsic positive end-expiratory pressure.
cardiac v's valves that control flow of blood through and from the heart.
coronary valve a valve at the entrance of the coronary sinus into the right atrium.
flail mitral valve a mitral valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the blood stream.
heart v's cardiac valves.
Heimlich valve a small one-way valve used for chest drainage, emptying into a flexible collection device; the valve prevents return of gases or fluids into the pleural space. The Heimlich valve is less than 13 cm (5 inches) long and facilitates patient ambulation; it can be used in many patients instead of a traditional water seal drainage system.
ileocecal valve (ileocolic valve) the valve guarding the opening between the ileum and cecum.
mitral valve the cardiac valve between the left atrium and left ventricle, usually having two cusps (anterior and posterior). Called also bicuspid valve.
Valves of the heart. The right heart pumps the venous blood into the lungs. The oxygenated blood returns from the lungs into the left atrium and is propelled by the left ventricle into the aorta. The insets show closed valves: the tricuspid valve has three leaflets, whereas the mitral valve has two leaflets. The aortic and pulmonary artery valves have three leaflets and resemble one another except for the fact that the coronary arteries originate from behind the cusps in the aorta. From Damjanov, 1996.
posterior urethral valve any of various types of congenital folds across the proximal part of the male urethra near the seminal colliculus, the most common cause of urethral obstruction in male infants.
pulmonary valve (pulmonic valve) the pocketlike cardiac valve that protects the orifice between the right ventricle and the pulmonary artery.
pyloric valve a prominent fold of mucous membrane at the pyloric orifice of the stomach.
semilunar v's the cardiac valves that have semilunar cusps; see aortic valve and pulmonary valve.
thebesian valve coronary valve.
tricuspid valve the cardiac valve guarding the opening between the right atrium and right ventricle.
valve of vein (venous v's) any of the small cusps or folds found in the tunica intima of many veins, serving to prevent backflow of blood.

valve

(valv), [TA]
1. A fold of the lining membrane of a canal or other hollow organ that serves to retard or prevent a reflux of fluid.
See also: valvule, plica.
2. Any formation or reduplication of tissue, or flaplike structure, resembling or functioning as a valve.
See also: valvule, plica.
Synonym(s): valva [TA]
[L. valva]

valva

/val·va/ (val´vah) pl. val´vae   [L.] a valve.

valve

(valv) [TA]
1. A fold of the lining membrane of a canal or other hollow organ serving to retard or prevent a reflux of fluid.
2. Any reduplication of tissue or flaplike structure resembling a valve.
See also: valvule, plica
[L. valva]

valva

pl. valvae [L.] a valve.
References in periodicals archive ?
Outer costal projection of left valva reaches apex.
Apenas foi referida a presenca da valva ostial do seio coronario na sua desembocadura no atrio direito por Chiarugi (1963), Bertho (1964), Schwarze e Schroder (1972), Nickel et al.
The specific name is derived from the character of valva.
Male genitalia with socii and teguminal processes; subscaphium present; gnathos upcurved; valva elongate; saccus as an elongate arm; vesica with cornutal zone comprised of spinules.
Valva said parents must be careful when choosing care items for their babies.
The DVC/Harris Interactive(SM) study has some interesting implications for marketers," said George Valva, CEO of DVC Worldwide and Chairman and CEO of DVC Group.
paramediana has a slender and sharper uncus, a considerably shorter and more rounded proximal lobe of valva, a slightly broader, less rounded cucullus, a more slender tegumen, a significantly longer and more curved ampulla and a shorter, somewhat thicker aedeagus compared with those of M.
We believe this patent is an exciting new development for the Internet," said George Valva, Chairman, DVCi Technologies.
Hopper also announced the election of Janet Paroo of NewSpring Ventures as Chairperson of the Board of Directors and Neil Contess, formerly a principal of marketing agencies Impiric and Dugan Valva Contess, to RealTime Media's board of directors.
The genus can be further distinguished from Alesa Doubleday, 1847 by the presence of bristle-like scales on the first and second labial palpi segments, and a characteristic long and bifurcate valva (Hall 2003).
The future is now," said George Valva, President & CEO of DVCI parent company Dugan Valva Contess.
Marketers are increasingly focused on spending that delivers measurable results with trade customers at the store level," commented George Valva, CEO of DVC Worldwide.