| ann | fib annulus fibrosus |
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| AF | Annulus fibrosus |
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| MAC | Mitral annulus calcification |
| TA | tricuspid annulus |
| Vieussens' annulus | A muscular ring surrounding the fossa ovalis in the wall of the right atrium of the heart. Synonym: annulus ovalis, margin of fossa ovalis, Vieussens' annulus, Vieussens' isthmus, Vieussens' limbus, Vieussens' ring. (05 Mar 2000) |
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| valve of Vieussens | A prominent valve in the great cardiac vein where it turns around the obtuse margin to become the coronary sinus. (05 Mar 2000) |
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| Vieussens' ansa | A nerve cord connecting the middle cervical and stellate sympathetic ganglia, forming a loop around the subclavian artery. Synonym: subclavian loop, Vieussens' ansa, Vieussens' loop. (05 Mar 2000) |
| Vieussens' centrum | The great mass of white matter composing the interior of the cerebral hemisphere; the name refers to the general shape of this white core in horizontal sections of the hemisphere. Synonym: centrum medullare, centrum ovale, medullary centre, semioval centre, Vicq d'Azyr's centrum semiovale, Vieussens' centrum. (05 Mar 2000) |
| Vieussens' foramina | <anatomy> A number of fossae in the wall of the right atrium, containing the openings of minute intramural veins. Synonym: foramina venarum minimarum cordis, foramina of the smallest veins of heart, Lannelongue's foramina, thebesian foramina, Vieussens' foramina. (05 Mar 2000) |
| Vieussens' ganglia | The largest and highest group of prevertebral sympathetic ganglia, located on the superior part of the abdominal aorta, on either side of the origin of the coeliac artery; contains sympathetic neurons whose unmyelinated postganglionic axons innervate the stomach, liver, gallbladder, spleen, kidney, small intestine, and ascending and transverse colon. H Synonym: ganglia coeliaca, semilunar ganglion, solar ganglia, Vieussens' ganglia, Willis' centrum nervosum. (05 Mar 2000) |
| Vieussens' isthmus | A muscular ring surrounding the fossa ovalis in the wall of the right atrium of the heart. Synonym: annulus ovalis, margin of fossa ovalis, Vieussens' annulus, Vieussens' isthmus, Vieussens' limbus, Vieussens' ring. (05 Mar 2000) |
| Vieussens' limbus | A muscular ring surrounding the fossa ovalis in the wall of the right atrium of the heart. Synonym: annulus ovalis, margin of fossa ovalis, Vieussens' annulus, Vieussens' isthmus, Vieussens' limbus, Vieussens' ring. (05 Mar 2000) |
| Vieussens' loop | A nerve cord connecting the middle cervical and stellate sympathetic ganglia, forming a loop around the subclavian artery. Synonym: subclavian loop, Vieussens' ansa, Vieussens' loop. (05 Mar 2000) |
| Vieussens, Raymond de | <person> French anatomist, 1641-1715. See: Vieussens' annulus, Vieussens' ansa, Vieussens' centrum, Vieussens' foramina, Vieussens' ganglia, Vieussens' isthmus, Vieussens' limbus, Vieussens' loop, Vieussens' ring, valve of Vieussens, Vieussens' valve, Vieussens' veins, Vieussens' ventricle. (05 Mar 2000) |
| Vieussens' ring | A muscular ring surrounding the fossa ovalis in the wall of the right atrium of the heart. Synonym: annulus ovalis, margin of fossa ovalis, Vieussens' annulus, Vieussens' isthmus, Vieussens' limbus, Vieussens' ring. (05 Mar 2000) |
| Vieussens' valve | The thin layer of white matter stretching between the two superior cerebellar peduncles, forming the roof of the superior recess of the fourth ventricle. Synonym: velum medullare superius, anterior medullary velum, Vieussens' valve. (05 Mar 2000) |
| Vieussens' veins | The small superficial vein's of the heart. Synonym: Vieussens' veins. (05 Mar 2000) |
| Vieussens' ventricle | A slitlike, fluid-filled space of variable width between the left and right transparent septum, which occurs in less than 10% of human brains and may communicate with the third ventricle. Synonym: cavum septi pellucidi, Duncan's ventricle, fifth ventricle, pseudocele, pseudoventricle, sylvian ventricle, ventricle of Sylvius, ventriculus quintus, Vieussens' ventricle, Wenzel's ventricle. (05 Mar 2000) |
| annulus | Ring like structure, adj. Annulate. (18 Nov 1997) |
| annulus abdominalis | The opening in the transversalis fascia through which the ductus deferens (or round ligament in the female) and gonadal vessels enter the inguinal canal. Located midway between anterior superior iliac spine and pubic tubercle, it is bounded medially by the lateral umbilical ligament (inferior epigastric vessels) and inferiorly by the inguinal ligament. Indirect inguinal hernias exit the abdominal cavity via the deep inguinal ring Synonym: annulus inguinalis profundus, abdominal ring, annulus abdominalis, internal inguinal ring. (05 Mar 2000) |
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