| median bar of Mercier | A prominent band of fibromuscular tissue involving the interureteric ridge or neck of the urinary bladder, occasionally resulting in urinary obstruction. (05 Mar 2000) |
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| median basilic vein | <anatomy, vein> The medial branch of the median antebrachial vein which joins the basilic vein. Synonym: vena intermedia basilica, median basilic vein, vena mediana basilica. (05 Mar 2000) |
| median cephalic vein | <anatomy, vein> The lateral branch of the median antebrachial vein that joins the cephalic vein near the elbow. Synonym: vena intermedia cephalica, median cephalic vein, vena mediana cephalica. (05 Mar 2000) |
| median cubital vein | <anatomy, vein> A vein which passes across the anterior aspect of the elbow from the cephalic vein to the basilic vein; commonly this vein is replaced by intermediate basilic and intermediate cephalic veins. The median cubital vein is often used for venipuncture. Synonym: vena intermedia cubiti, intermediate cubital vein, vena mediana cubiti. (05 Mar 2000) |
| median effective dose | The dose that produces the desired effect; when followed by a subscript (generally "ED50"), it denotes the dose having such an effect on a certain percentage (e.g., 50%) of the test animals; ED50 is the median effective dose, in radiation protection, the sum of the equivalent doses in all tissues and organs of the body weighted for tissue effects of radiation. The unit of effective dose is the sievert (Sv), epilation dose, the minimum amount of radiation sufficient to produce hair loss, usually in 10 to 14 days. (05 Mar 2000) |
| median eminence | <anatomy> Raised area on the infundibular hypothalamus at the floor of the third ventricle of the brain which contains the primary capillary network of the hypophyseal portal system. (12 Dec 1998) |
| median glossoepiglottic fold | <anatomy> A fold of mucous membrane in the midline that extends from the back of the tongue to the epiglottis, forming the medial boundary of the epiglottic valleculae. Synonym: plica glossoepiglottica mediana, frenulum epiglottidis, middle glossoepiglottic fold. (05 Mar 2000) |
| median groove of tongue | <anatomy> Median groove or median longitudinal raphe of tongue; raphe linguae; a slight longitudinal depression running forward on the dorsal surface of the tongue from the foramen caecum. Synonym: sulcus medianus linguae, median longitudinal raphe of tongue, raphe linguae. (05 Mar 2000) |
| median laryngotomy | Operative opening into the larynx, generally through the midline, commonly done for the excision of early carcinoma or the correction of laryngostenosis. Synonym: median laryngotomy, thyrofissure, thyroidotomy, thyrotomy. (05 Mar 2000) |
| median line | <anatomy> See: anterior median line, posterior median line. (05 Mar 2000) |
| median lithotomy | <surgery> Lithotomy in which the perineal incision is made in the median raphe. Synonym: marian lithotomy. (05 Mar 2000) |
| median longitudinal raphe of tongue | <anatomy> Median groove or median longitudinal raphe of tongue; raphe linguae; a slight longitudinal depression running forward on the dorsal surface of the tongue from the foramen caecum. Synonym: sulcus medianus linguae, median longitudinal raphe of tongue, raphe linguae. (05 Mar 2000) |
| median mandibular point | <anatomy> A point on the anteroposterior centre of the mandibular ridge in the median sagittal plane. (05 Mar 2000) |
| median maxillary anterior alveolar cleft | <anatomy> An asymptomatic midline defect of the maxillary anterior ridge; the result of a failure of fusion or development of the lateral halves of the palate. (05 Mar 2000) |
| median nerve | <anatomy, nerve> A major nerve of the upper extremity. In humans, the fibres of the median nerve originate in the lower cervical and upper thoracic spinal cord (usually c6 to t1), travel via the brachial plexus, and supply sensory and motor innervation to parts of the forearm and hand. (12 Dec 1998) |