| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
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| MS | Maffuci syndrome; maladjustment score; mandibular series; Marfan syndrome; Marie-Strumpell [syndrome... |
| MVE | mitral valve echo; mitral valve excursion; Murray Valley encephalitis |
| PML | peripheral motor latency; polymorphonuclear leukocyte; posterior mitral leaflet; progressive multifo... |
| PMV | paramyxovirus; percutaneous mitral balloon valvotomy; prolapse of mitral valve |
| aortic opening | The opening in the diaphragm bounded by the two crura, the vertebral column, and the median arcuate ligament, through which pass the aorta and thoracic duct. Synonym: hiatus aorticus, aortic foramen, aortic opening. (05 Mar 2000) |
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| cardiac opening | The trumpet-shaped opening of the oesophagus into the stomach. Synonym: ostium cardiacum, cardiac opening, oesophagogastric orifice. (05 Mar 2000) |
| vaginal opening | The narrowest portion of the canal, in the floor of the vestibule posterior to the urethral orifice. Synonym: ostium vaginae, orificium vaginae, vaginal opening. (05 Mar 2000) |
| vertical opening | The length of the face determined by the distance of separation of jaws. Occlusal vertical dimension (ovd or vdo) or contact vertical dimension is the lower face height with the teeth in centric occlusion. Rest vertical dimension (vdr) is the lower face height measured from a chin point to a point just below the nose, with the mandible in rest position. (12 Dec 1998) |
| cathodal opening clonus | An obsolete term for a clonus produced near a cathode when the flow of current is stopped. (05 Mar 2000) |
| cathodal opening contraction | An obsolete term for the momentary contraction of a muscle under the influence of the negative pole when the circuit is broken. (05 Mar 2000) |
| cathodal opening tetanus | An obsolete term for a tonic contraction in a muscle, to which the cathode is applied; when the circuit is opened, the contraction is suddenly interrupted. (05 Mar 2000) |
| Ritter's opening tetanus | The tetanic contraction that occasionally occurs when a strong current, passing through a long stretch of nerve, is suddenly interrupted. (05 Mar 2000) |
| pharyngeal opening of auditory tube | An opening in the upper part of the nasopharynx about 1.2 cm behind the posterior extremity of the inferior concha on each side. Synonym: ostium pharyngeum tubae auditivae, pharyngeal opening of eustachian tube. (05 Mar 2000) |
| pharyngeal opening of eustachian tube | An opening in the upper part of the nasopharynx about 1.2 cm behind the posterior extremity of the inferior concha on each side. Synonym: ostium pharyngeum tubae auditivae, pharyngeal opening of eustachian tube. (05 Mar 2000) |
| piriform opening | The anterior nasal opening in the skull. Synonym: apertura piriformis, piriform opening. (05 Mar 2000) |
| cornua of falciform margin of saphenous opening | See: inferior horn of falciform margin of saphenous opening, superior horn of falciform margin of saphenous opening. (05 Mar 2000) |
| crest of cochlear opening | The edge of the opening of the cochlear window to which the secondary tympanic membrane is attached. Synonym: crista fenestrae cochleae, crest of cochlear opening. (05 Mar 2000) |
| saphenous opening | The opening in the fascia lata inferior to the medial part of the inguinal ligament through which the saphenous vein passes to enter the femoral vein. Synonym: hiatus saphenus, fossa ovalis, saphenous hiatus. (05 Mar 2000) |
| horns of saphenous opening | See: inferior horn of falciform margin of saphenous opening, superior horn of falciform margin of saphenous opening. (05 Mar 2000) |