| Pityrosporum ovale | 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) |
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| Pityrosporum | A genus of nonpathogenic fungi found in dandruff and seborrheic dermatitis. Origin: G. Pityron, bran, + sporos, seed (05 Mar 2000) |
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| Pityrosporum orbiculare | A fungus species which causes tinea versicolor and which may cause folliculitis. Synonym: Pityrosporum orbiculare. (05 Mar 2000) |
| valve of foramen ovale | 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) |
| venous plexus of foramen ovale | 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) |
| centrum ovale | 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) |
| Plasmodium ovale | A species that is the agent of the least common form of human malaria; resembles Plasmodium vivax in its earlier stages, but often modifies the cell membrane, causing it to form a fimbriated outline, and often assume an oval shape; Schuffner's dots are abundant and appear early, host cells are normal or only slightly enlarged, and only about 8 to 10 grapelike merozoites are produced; fever is tertian (every 48 hours), and relapses are infrequent. (05 Mar 2000) |
| foramen ovale | <anatomy, cardiology> The communication between the two atria of the foetal heart. If it remains open (atrial septal defect), then blood will shunt from left to right. (04 Apr 1998) |