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 ?
Mediante la sospecha clinica debido al mecanismo del trauma, la severidad del cuadro clinico y los sintomas del paciente se orientaron las herramientas diagnosticas con el fin de obtener un diagnostico certero describiendo un caso de insuficiencia tricuspide severa secundaria a ruptura de cuerda tendinosa de la valva anterior.
Se distingue de estas especies por la genitalia del macho que tiene la valva ventral acuminada en el apice y la armadura del saco interno de la genitalia del macho.
A doenca cronica da valva mitral frequentemente leva a uma insuficiencia cardiaca e e uma causa frequente de insuficiencia cardiaca congestiva no cao idoso (3, 4, 7).
Datos morfometricos: largo: 7,3-35,6 [micron]m; ancho: 4,2-10,6 [micron]m; 18 estrias en 10 en la valva con rafe y 20-22 estrias en 10 [micron]m en la valva sin rafe.
O ponto maximo do movimento de abertura do folheto septal ou anterior da valva mitral (ponto E) ao septo interventricular, a chamada distancia E-septo, nao sofreu alteracoes significativas no decorrer do estudo no grupo dos caes tratados assim como no grupo dos nao tratados com carvedilol.
Lafontaine (2004) agrega a los caracteres mencionados anteriormente: dilatamiento basal de la vesica, usualmente con numerosos lobulos; ausencia de diverticulos medios y apicales; apice del aedoeagus con forma de gancho en el lado derecho y dilatacion redondeada de las valvas, bien diferenciada, ubicada entre la base del clasper y la costa.
El cambio de arte de pesca seria tambien el responsable del incremento de la mortalidad natural, ya que la presion de agua, generada por la motobomba, no solo mataria directamente los individuos al danar sus valvas, sino que ademas muchos individuos no serian capaces de enterrarse y quedarian vulnerables a los depredadores o moririan por lesiones o stress, lo cual se traduciria en una importante mortalidad post-pesca, (Gaspar et al.
4]) se observo la presencia de diatomeas pena les epifitas pertenecientes al genero Pseudo-nitzschia sobre las valvas de C.
Los especimenes recolectados son de tamano medio para la especie (diametro umbonopaleal medio: 7,2 cm), pero se llega a contabilizar hasta 85 trazas sobre una sola valva, con un promedio de 60 trazas/valva.
Prolapso de valvula mitral, segundo Silbernagl e Lang, (2006) na regurgitacao mitral (RM, algumas vezes tambem chamada de insuficiencia mitral) a valva mitral perde sua funcao de valvula, e, assim algum sangue do ventriculo esquerdo flui de volta ("regurgita") para o atrio esquerdo durante a sistole.