| Marchetti, Andrew | <person> U.S. Obstetrician and gynecologist, 1901-1970. See: Marshall-Marchetti-Krantz operation. (05 Mar 2000) |
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| Marchi's fixative | A mixture of Muller's fixative with osmium tetroxide, with potassium chlorate substituted for the potassium dichromate of Muller's fixative for better results; used to demonstrate degenerating myelin. See: Marchi's stain. (05 Mar 2000) |
| Marchi's reaction | Failure of the myelin sheath of a nerve to blacken when submitted to the action of osmic acid. (05 Mar 2000) |
| Marchi's stain | <technique> A staining method in which the specimen is hardened for 8 to 10 days in a modified Muller's fixative, followed by immersion for 1 to 3 weeks in the same with the addition of osmic acid; fat and degenerating nerve fibres stain black. (05 Mar 2000) |
| Marchi's tract | A bundle of thick, heavily myelinated fibres originating in the deep layers of the superior colliculus, crossing to the opposite side in the dorsal tegmental decussation, descending along the median plane, between the medial longitudinal fasciculus dorsally, the medial lemniscus ventrally, into the anterior funiculus of the spinal cord. The tract ends in the medial region of the anterior horn of the cervical spinal cord, and appears to be involved in head movements during visual and auditory tracking. Throughout its course in the brainstem it is accompanied by fibres of the tectobulbar tract. Synonym: tractus tectospinalis, Held's bundle, Loewenthal's bundle, Loewenthal's tract, Marchi's tract, predorsal bundle. (05 Mar 2000) |
| Marchi, Vittorio | <person> Italian physician, 1851-1908. See: Marchi's fixative, Marchi's reaction, Marchi's stain, Marchi's tract. (05 Mar 2000) |
| Marchiafava, Ettore | <person> Italian pathologist, 1847-1935. See: Marchiafava-Bignami disease, Marchiafava-Micheli anaemia, Marchiafava-Micheli syndrome. (05 Mar 2000) |
| marchiafava-bignami disease | <radiology> Italian wine-drinkers' disease, symmetric demyelinization: corpus callosum, white matter, anterior commisure (12 Dec 1998) |
| Marchiafava-Micheli anaemia | An infrequent disorder with insidious onset (usually in the third or fourth decade) and chronic course, characterised by episodes of haemolytic anaemia, haemoglobinuria (chiefly at night), pallor, icterus or bronzing of the skin, a moderate degree of splenomegaly, and sometimes hepatomegaly; red blood cells are usually macrocytic and vary considerably in size, but there is no evidence of spherocytosis, erythrophagocytosis, or abnormal leukocytes. The disorder is a result of an abnormality of the red cell membrane which makes the red cell unusually sensitive to lysis by complement. Synonym: Marchiafava-Micheli anaemia, Marchiafava-Micheli syndrome. (05 Mar 2000) |
| Marchiafava-Micheli syndrome | An infrequent disorder with insidious onset (usually in the third or fourth decade) and chronic course, characterised by episodes of haemolytic anaemia, haemoglobinuria (chiefly at night), pallor, icterus or bronzing of the skin, a moderate degree of splenomegaly, and sometimes hepatomegaly; red blood cells are usually macrocytic and vary considerably in size, but there is no evidence of spherocytosis, erythrophagocytosis, or abnormal leukocytes. The disorder is a result of an abnormality of the red cell membrane which makes the red cell unusually sensitive to lysis by complement. Synonym: Marchiafava-Micheli anaemia, Marchiafava-Micheli syndrome. (05 Mar 2000) |
| marching | Fr. March, Marching money A regiment in active service. In England, a regiment liable to be ordered into other quarters, at home or abroad; a regiment of the line. Source: Websters Dictionary (01 Mar 1998) |
| marchion-ess | The wife or the widow of a marquis; a woman who has the rank and dignity of a marquis. Origin: LL. Marchionissa, fr. Marchio a marquis. See Marquis. Source: Websters Dictionary (01 Mar 1998) |
| marcid | Emaciating; wasting away. Origin: L. Marcidus; fr. Marceo, to wither (05 Mar 2000) |
| Marcille's triangle | An area bounded by the medial border of the psoas major, the lateral margin of the vertebral column, and the iliolumbar ligament below; it is crossed by the obturator nerve. (05 Mar 2000) |
| Marcille, Maurice | <person> 1871-1941. See: Marcille's triangle. (05 Mar 2000) |