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.
Tegumen laterally triangular, with half length of uncus; subuncus absent; anterior projection of saccus elongated, straight, and cylindrical; valvae approx.
6, 7 (Clade C)) is supported by having an anal lobe in the hindwing (8:1; later lost in the ancestor of Bibarrambla allenella), having the distal process of the male genitalia linear to curved at the tip, bifid, or quadrate (31:1; the distal process is later lost in the ancestor of the artemisiae group, the pastinacella group), and having the valvae broadest at base or nearly parallel sided (36:1 and 36:0; evolving multiple times within Depressariinae), and the parallelism of having a rounded vinculum (43:1).
The theological bind which Rossetti presents is this: the sliding bar used to bolt her heart's door, reinforced by the interlocking "mock"/"cock" rhyme, shuts her in, even as it shuts Christ out (these are not valvae, or two-way folding doors).
Valvae with costa linear; cucullus like halters; valvula sclerotized, sickle shape; sacculus shorter than costa, saccular process broad and elevated in front.
fuscistriga (Hampson) costal spot; male genitalia with uncus swollen at tip, distal saccular process of valvae wavy and strongly angled
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 are of even width, with small cutout on apex.
Valvae lack projections, uncus bifid, aedeagus long, cylindrical and vesica with several cornuti (see Mielke 1971; Mielke 1993; Mielke & Schroeder 1994).
7), straight, slightly widened in profile, very narrow from above, with distal part almost gradually narrowing to acute apex, brown dorsal and clearly lighter ventral valvae, and without distinct traces of imaginal slip sutures between valves.
The male genitalia of this new species possess asymmetric valvae, a characteristic that is previously unreported from Urodoidea.
unpublished), but can be distinguished from the latter by the following characters: forewing ground color brownish grey, costa dark brown with yellow-brown patterns, forewing with a median pale blue kidney-shaped translucent spot, dorsum brownish-grey with medial yellow-brown patterns; hind wing ground color brownish grey, dorsum with yellowish white stripes and spots; abdomen conical, brownish-grey, terminal fan-shaped scale-tufts; uncus not forked, thin and pointed apically, valvae fused basally, bifid postmedially, costa long sickle-shaped, bending inwardly to base of uncus.