| oblique projection | Any radiographic projection between frontal and lateral. (05 Mar 2000) |
|---|---|
| oblique ridge | A ridge on the masticatory surface of an upper molar tooth from the mesiolingual to the distobuccal cusp. (05 Mar 2000) |
| oblique ridge of trapezium | A prominent ridge on the trapezium forming the lateral border of the groove in which runs the tendon of the flexor carpi radialis. Synonym: tuberculum ossis trapezii, oblique ridge of trapezium. (05 Mar 2000) |
| oblique section | A diagonal cross section attained by slicing, actually or through imaging techniques, the body or any part of the body or anatomic structure, in any plane which does not parallel the longitudinal axis or intersect it at a right angle, i.e., which is neither longitudinal (vertical) nor transverse (horizontal). Synonym: diagonal section. (05 Mar 2000) |
| oblique sinus of pericardium | The recess in the pericardial cavity posterior to the base of the heart bounded laterally by the pericardial reflections on the pulmonary veins and inferior vena cava, and posteriorly by the pericardium overlying the anterior aspect of the oesophagus. Synonym: sinus obliquus pericardii, oblique sinus of pericardium. (05 Mar 2000) |
| oblique vein of left atrium | A small vein on the posterior wall of the left atrium which merges with the great cardiac vein to form the coronary sinus; it is developed from the left common cardinal vein, and occasionally persists as a left superior vena cava. Synonym: vena obliqua atrii sinistri, Marshall's oblique vein. (05 Mar 2000) |
| obliquity | Absence of synclitism or parallelism between the axis of the presenting part of the child and the pelvic planes in childbirth. Synonym: obliquity. Origin: G. A-priv. + syn-klino, to incline together (05 Mar 2000) |
| obliquus | Denoting a structure having an oblique course or direction; a name given, with further qualification, to several muscles. See: muscle. Origin: L. Slanting, oblique (05 Mar 2000) |
| obliquus capitis inferior | <anatomy, muscle> Origin, spinous process of axis; insertion, transverse process of the atlas; action, rotates head; origin, spinous process of axis; insertion, transverse process of the atlas; nerve supply, suboccipital. See: suboccipital muscles. Synonym: musculus obliquus capitis inferior, inferior oblique muscle of head. (05 Mar 2000) |
| obliquus capitis superior | <anatomy, muscle> Origin, transverse process of atlas; insertion, lateral third of inferior nuchal line; action, rotates head; nerve supply, suboccipital. See: suboccipital muscles. Synonym: musculus obliquus capitis superior, superior oblique muscle of head. (05 Mar 2000) |
| obliterate | <zoology> Scarcely distinct; applied to the markings of insects. Source: Websters Dictionary (01 Mar 1998) |
| obliterating pericarditis | Complete obliteration by postinflammatory adhesions of the pericardial cavity. (05 Mar 2000) |
| obliteration | Blotting out, especially by filling of a natural space or lumen by fibrosis or inflammation. In radiology, disappearance of the contour of an organ when the adjacent tissue has the same X-ray absorption. Origin: L. Oblittero, to blot out (05 Mar 2000) |
| obliterative arachnoiditis | Thickening of the leptomeninges, sometimes with obliteration of the subarachnoid space; commonly related to acute or chronic leptomeningitis of bacterial or chemical origin. See: leptomeningeal fibrosis. Synonym: obliterative arachnoiditis. (05 Mar 2000) |
| oblong fovea of arytenoid cartilage | A broad shallow depression on the anterolateral surface of the arytenoid cartilage, for attachment of the thyroarytenoid muscle. Synonym: fovea oblonga cartilaginis arytenoideae, oblong pit of arytenoid cartilage. (05 Mar 2000) |