| anulus | An alternate term for ring. Origin: L. (05 Mar 2000) |
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| annulus ovalis | 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) |
| valvula foraminis ovalis | A fold projecting into the left atrium from the margin of the foramen ovale in the foetus; when, with beginning inspiration, the blood pressure within the left atrium increases, the valve closes and its edges become adherent to the margin of the foramen ovale, occluding it. Synonym: valvula foraminis ovalis, falx septi, valve of oval foramen. (05 Mar 2000) |
| Malassezia ovalis | A species of yeast found in superficial epidermal scales and hair follicles on oily skin, of borderline pathogenicity; may cause seborrheic dermatitis associated with immune deficiency. Synonym: Pityrosporum ovale. (05 Mar 2000) |
| margin of fossa ovalis | 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) |
| rete foraminis ovalis | A venous network around the mandibular nerve connecting the cavernous sinus and the pterygoid plexus. Synonym: plexus venosus foraminis ovalis, rete foraminis ovalis. (05 Mar 2000) |
| plexus venosus foraminis ovalis | A venous network around the mandibular nerve connecting the cavernous sinus and the pterygoid plexus. Synonym: plexus venosus foraminis ovalis, rete foraminis ovalis. (05 Mar 2000) |
| fenestra nov-ovalis | Artificial opening through the otic capsule of the lateral saemicircular canal, connecting the membranous labyrinth with the mastoid cavity produced during fenestration surgery. (05 Mar 2000) |
| fenestra ovalis | An oval opening on the medial wall of the tympanic cavity leading into the vestibule, closed in life by the foot of the stapes. Synonym: fenestra of the vestibule, fenestra ovalis, oval window, vestibular window. (05 Mar 2000) |
| fossa ovalis | An oval depression on the lower part of the septum of the right atrium; it is a vestige of the foramen ovale, and its floor corresponds to the septum primum of the foetal heart. Synonym: saphenous opening. (05 Mar 2000) |
| limbus fossae ovalis | 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) |