| Kerckring's centre | An occasional independent ossification centre in the occipital bone; it appears in the posterior margin of the foramen magnum at about the sixteenth week of gestation. Synonym: Kerckring's ossicle. (05 Mar 2000) |
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| Kerckring's folds | The numerous folds of the mucous membrane of the small intestine, running transversely for about two-thirds of the circumference of the gut. Synonym: circular folds, Kerckring's folds, Kerckring's valves, valvulae conniventes. (05 Mar 2000) |
| Kerckring's ossicle | An occasional independent ossification centre in the occipital bone; it appears in the posterior margin of the foramen magnum at about the sixteenth week of gestation. Synonym: Kerckring's ossicle. (05 Mar 2000) |
| Kerckring's valves | The numerous folds of the mucous membrane of the small intestine, running transversely for about two-thirds of the circumference of the gut. Synonym: circular folds, Kerckring's folds, Kerckring's valves, valvulae conniventes. (05 Mar 2000) |
| Kerckring, Theodor | <person> Dutch anatomist, 1640-1693. See: Kerckring's centre, Kerckring's folds, ossicle, Kerckring's valves. (05 Mar 2000) |
| abnormal cleavage of cardiac valve | Congenital malformation of a valve leaflet with a defect extending from the free margin. (05 Mar 2000) |
| Amussat's valve | A series of crescentic folds of mucous membrane in the upper part of the cystic duct, arranged in a somewhat spiral manner. Synonym: plica spiralis ductus cystici, Amussat's valve, Heister's valve, spiral valve of cystic duct, valvula spiralis. (05 Mar 2000) |
| anterior cusp of atrioventricular valve | The anterior leaflet or valvule of either the tricuspid or mitral valves. Synonym: cuspis anterior valvae atrioventricularis dextrae/sinistrae. (05 Mar 2000) |
| anterior urethral valve | A crescentic horizontal fold in the proximal spongy urethra. (05 Mar 2000) |
| aortic valve | The heart valve that divides the left ventricle and the aorta. The aortic valve opens during left ventricular contraction and then closes to prohibit the backwash of oxygenated blood from the aorta into the ventricle. The aortic valve has 3 valve cusps. (27 Sep 1997) |
| aortic valve insufficiency | Backflow of blood from the aorta into the left ventricle, owing to imperfect functioning of the aortic semilunar valve. (12 Dec 1998) |
| aortic valve prolapse | The downward displacement of the cuspal material (misalignment of the cusps) below a line joining points of attachment of the aortic valve leaflets. The prolapsed cusp may occlude the ventricular septal defect during ventricular diastole. (12 Dec 1998) |
| aortic valve stenosis | Narrowing of the orifice of the aortic valve or of the supravalular or subvalvular regions. (12 Dec 1998) |
| artificial heart valve | <cardiology> A synthetic or porcine (pigskin) valve surgically placed into the heart to replace a defective or malfunctioning valve. The aortic and mitral valves are the most frequently replaced with artificial valves. (27 Sep 1997) |
| ball valve | Any of a variety of prosthetic cardiac valve's comprised of a ball within a retaining cage affixed to the orifice; when appropriately sized, used in aortic, mitral, or tricuspid position. (05 Mar 2000) |