| mecism | Abnormal elongation of the body or one or more of its parts. Origin: G. Mekos, length, -ismos, condition (05 Mar 2000) |
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| Mecistocirrus | A monotypic genus of trichostrongylid nematodes (subfamily Mecistocirrinae), with the single species, Mecistocirrus digitatus; it is not grossly distinguished from Haemonchus contortus and has about the same effect on the host. Mecistocirrus is distributed chiefly in Asia in cattle, sheep, buffalo, bison, the stomach of pigs, and occasionally in humans. Origin: G. Mekistos, very long, + L. Cirrus, curl, the protruding male organ of a nematode (05 Mar 2000) |
| Mecke's reagent | A solution of selenous acid in sulfuric acid, used for colour tests of alkaloids. (05 Mar 2000) |
| meckel diverticulum | <radiology> Rule of secondarys, 2 cm wide, 2 feet from I-C valve, males 2:1, 2% of population, antimesenteric (unlike duplication cyst), with or without ectopic gastric/pancreatic tissue see: Meckel scan (12 Dec 1998) |
| meckel scan | <radiology> Agent: Tc-99m pertechnetate, prep: pentagastrin -- increase acid production, cimetidine -- block secretion of acid, glucagon -- decrease bowel activity see also: Meckel diverticulum (12 Dec 1998) |
| Meckel syndrome | A malformation syndrome, lethal in the perinatal period, and characterised by intrauterine growth retardation, sloping forehead, occipital exencephalocele, ocular anomalies, cleft palate, polydactyly, polycystic kidney, and other malformations; autosomal recessive inheritance. Synonym: Meckel syndrome, Meckel-Gruber syndrome. (05 Mar 2000) |
| Meckel's band | The portion of the anterior ligament of the malleus that extends from the base of the anterior process through the petrotympanic fissure, to attach to the spine of the sphenoid. See: anterior ligament of malleus. Synonym: Meckel's ligament. (05 Mar 2000) |
| Meckel's cartilage | A cartilage bar in the mandibular arch that forms a temporary supporting structure in the embryonic mandible; the cartilagenous primordia of the malleus and incus develop from its proximal end, and it also gives rise to the sphenomandibular and anterior malleolar ligaments. Synonym: Meckel's cartilage. (05 Mar 2000) |
| Meckel's cavity | The cleft in the meningeal layer of dura of the middle cranial fossa near the tip of the petrous part of the temporal bone; it encloses the roots of the trigeminal nerve and the trigeminal ganglion. Synonym: cavum trigeminale, Meckel's cavity, Meckel's space, trigeminal cavity. (05 Mar 2000) |
| meckel's diverticulum | An out-pouching of the small bowel (ileum). Present in about 2% of people and usually occurs about 2 feet before the junction with the colon. Can be lined by stomach-type mucosa and ulcerate, perforate, or cause small bowel obstruction. (12 Dec 1998) |
| Meckel's ganglion | A small parasympathetic ganglion in the upper part of the pterygopalatine fossa whose postsynaptic fibres supply the lacrimal, nasal, palatine and pharyngeal glands. Synonym: ganglion pterygopalatinum, Meckel's ganglion, nasal ganglion, sphenopalatine ganglion. (05 Mar 2000) |
| Meckel's ligament | The portion of the anterior ligament of the malleus that extends from the base of the anterior process through the petrotympanic fissure, to attach to the spine of the sphenoid. See: anterior ligament of malleus. Synonym: Meckel's ligament. (05 Mar 2000) |
| Meckel's plane | A craniometric plane cutting the alveolar and the auricular points. (05 Mar 2000) |
| Meckel's space | The cleft in the meningeal layer of dura of the middle cranial fossa near the tip of the petrous part of the temporal bone; it encloses the roots of the trigeminal nerve and the trigeminal ganglion. Synonym: cavum trigeminale, Meckel's cavity, Meckel's space, trigeminal cavity. (05 Mar 2000) |
| Meckel, Johann F Jr | <person> German comparative anatomist and embryologist, 1781-1833. See: Meckel scan, Meckel syndrome, Meckel's cartilage, Meckel's diverticulum, Meckel's plane, Meckel-Gruber syndrome. (05 Mar 2000) |