valva

(redirected from Valvae)

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 classic literature ?
He was not much acquainted with valves of any sort, but he knew that valvae were folding-doors, and through this crevice came a sudden light startling him with his first vivid notion of finely adjusted mechanism in the human frame.
Las valvae son rectangulares dorsalmente, sinuosas en la parte distal con setas numerosas en la zona interna.
Tegumen laterally triangular, with half length of uncus; subuncus absent; anterior projection of saccus elongated, straight, and cylindrical; valvae approx.
Measurements were defined as follows: total length, the distance between the frons and the apex of the flexed and parallel aligned to body hind femora; length of pronotal disc, the median length of the disc from anterior to posterior margin; length of hind femur, the greatest dimension of that structure as seen in lateral view; length of tegmen, the greatest dimension of that structure as seen in lateral view; and length of ovipositor, the distance from the anterior margin of ventral valvae to the apex of the ovipositor.
5) but differs as follows: in the lateral view of the genitalia, the uncus is narrower and elongate; the tegumen is smaller; the aedeagus is slightly curved downward and convex at the middle section and flattens towards the anterior below the antero-dorsally open tip, posterior slightly curved upward and tapered, opens posteriorly; the distal half of the valvae are rather rectangular and not convex at the apex.
Forewings covered with white scales and brownish mixed scales, without macula and transversal line, only sub-terminal line is remarkable; hindwings covered with white and brownish mixed scales; genitalia: uncus rounded, with an apical spine, short valvae, without corona, triangle like saccus, short ampulla slightly curved, apex ampulla reach to the border of valva, cornuti with six thick spine of bulbous base.
Tegumen prominente pero no tan curvado a nivel ventral como en la especie nominotipica, vinculum recto y alargado, saccus muy corto y poco perceptible, valvae en vista lateral cilindricas y curvas, con el proceso apical con punta redondeada y el proceso dorsal grueso, sacculus en forma de gancho y el gnathos poco conspicuo.
Valvae with costa linear; cucullus like halters; valvula sclerotized, sickle shape; sacculus shorter than costa, saccular process broad and elevated in front.
sabia in the shape of the valvae, but is easily distinguishable from the latter species by the shape of the uncus and saccus, and also by the cutout on the valvae apex.
Valvae of male distinguished by dorsal lobe near apex and setal tuft on ventrum.
Valvae lack projections, uncus bifid, aedeagus long, cylindrical and vesica with several cornuti (see Mielke 1971; Mielke 1993; Mielke & Schroeder 1994).