| LM | lactic acid mineral [medium]; lactose malabsorption; laryngeal mask; laryngeal muscle; lateral malle... |
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| MG | Marcus Gunn [pupil]; margin; medial gastrocnemius [muscle]; membranous glomerulonephritis; menopausa... |
| MS | Maffuci syndrome; maladjustment score; mandibular series; Marfan syndrome; Marie-Strumpell [syndrome... |
| PM | after death (Lat. post mortem); after noon [Lat. post meridiem]; mean pressure; pacemaker; pantomogr... |
| LPO | Left Posterior Oblique view |
| oblique popliteal ligament | <anatomy> Reflected tendon of insertion of semimembranous muscle; a fibrous band that extends across the back of the knee from its separation from the direct tendon of insertion on the medial condyle of the tibia to the lateral condyle of the femur. Synonym: ligamentum popliteum obliquum, Bourgery's ligament. (05 Mar 2000) |
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| 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) |
| extinction oblique | <microscopy> Vibration directions oblique to the long direction of the crystal or fibre. (05 Aug 1998) |
| lateral oblique radiograph | A radiographic view of the mandible, revealing one side of the mandible from symphysis to condyle by displacing the other side upwards. (05 Mar 2000) |
| abdominal | <anatomy> Pertaining to the abdomen. Origin: L. Abdominalis (18 Nov 1997) |
| abdominal abscess | <surgery> A localised pus-forming (suppurative) bacterial infection that occurs within the abdominal cavity as the result of a perforated viscus or post operative complication. Treatment requires either percutaneous or open surgical drainage. (27 Sep 1997) |
| abdominal adhesions | <surgery> Scarring that can occur within the abdomen in response to surgery or chronic inflammation. (27 Sep 1997) |
| abdominal angina | <surgery> A dull, crampy centralised abdominal pain that occurs 15-30 minutes after a meal. Associated with ischaemic bowel disease. Evaluated with mesenteric arteriography. (27 Sep 1997) |
| abdominal aorta | <anatomy> The largest arterial conduit below the diaphragm. This term refers to the portion of the aorta below the diaphragm to the bifurcation into the right and left common iliac arteries. It supplies blood to the abdominal viscera, pelvic organs and lower extremities. (20 Jun 2000) |
| abdominal aortic aneurysm | <surgery> A distended and weakened area in the wall of the abdominal aorta, more common in those who suffer from atherosclerosis. Symptoms include sudden, severe abdominal pain with radiation to the back. (27 Sep 1997) |