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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
dentate but the valva is very wide and the ampulla is relatively thick.
La cavidad ventricular izquierda estaba incompletamente dividida en dos compartimentos por la cuspide septal de la valva mitral.
Valva del pene ventralmente curvada, dorsalmente con diente valvar (Fig.
Leyenda: Oxynetra confusa franciscana ssp.n., ad: proceso distal del aedeagus; ap: proceso posterior del aedeagus; c: constriccion dorso-ventral de la base del uncus; d: domo del uncus; g: gnathos; pd: proceso dorsal de la valva; pa: proceso apical de la valva; psa: proceso sacular; sa: saccus; T: tegumen; V: valva; Vi: vinculum
Forma de las valvas: subtriangulares (0); subcuadrangulares (1); subrectangulares (2) 12.
2 Hojas 25-35(-40) cm de longitud; petalos 10-11 cm de largo; gineceo de 2 cm de largo, con estilos delgados y cortos, estambres 200-220; carpelos 30-40; margen de valva carpelar angosto, 0.2-0.3 cm de grosor; Mexico: Nuevo Leon; 1500-1700 m s.n.m M.
Como en la mayoria de los pectinidos, las caracteristicas morfologicas especificas de la almeja voladora se observaron despues de la metamorfosis, con la secrecion de la disoconcha, cuando se fue adquiriendo la morfologia del adulto, al formarse las costillas, auriculas de la concha, y el desarrollo de la concha con una valva convexa y una valva plana.
2f-2g) Uncus sclerotised, curved, slender distally; tegumen broad; juxta plate-like, bilobed; saccus V-shaped, without saccular process; valva broad, outwardly curved, distally cone-shape lobe with small hair; aedeagus broad, rod-like, dorsoventrally curved, dorsally a pair of hex-dentate thecal appendage, ventrally membranous lobe Female Genitalia (Fig.
Muma Padurii, in Transylvania also known as valva is an obsessive presence in story tales and legends.