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 mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


meromelia
Partial absence of a free limb (exclusive of girdle); e.g., hemimelia, phocomelia. ... Origin: mero-+ G. Melos, a limb ... (05 Mar 2000) ...

meromicrosomia
Abnormal smallness of some portion of the body; local dwarfism. ... Origin: mero-+ G. Mikros, small, + soma, body ... (05 Mar 2000) ...

meromyosin
<protein> Fragments of myosin formed by trypsin digestion. Heavy meromyosin (HMM) has the hinge region and ATPase activity, light meromyosin (LMM) is mostly _ helical and is the portion normally laterally associated with other LMM to form the thick filament itself. ... (18 Nov 1997) ...

meront
A stage in the life cycle of sporozoans in which multiple asexual fission (schizogony) occurs, resulting in production of merozoites. ... See: schizont. ... (05 Mar 2000) ...

merorachischisis
Merorrhachischisis ... Fissure of a portion of the spinal cord. ... Synonym: mesorrhachischisis, rachischisis partialis. ... Origin: mero-+ G. Rhachis, spine, + schisis, fissure. ... (05 Mar 2000) ...

merosin
<protein> See laminin. ... (18 Nov 1997) ...

merosmia
A condition in which the perception of certain odours is wanting; analogous to colour blindness. ... Origin: mero-+ G. Osme, smell ... (05 Mar 2000) ...

merosporangium
A cylindrical small sporangium containing few spores and found in certain Zygomycetes. ... Origin: G. Meros, part, + sporangium ... (05 Mar 2000) ...

merosystolic
Partially systolic; relating to a portion of the systole of the heart. ... Origin: mero-+ systole ... (05 Mar 2000) ...

merotomy
<procedure> Partial cutting: used in reference to experiments in which protozoa are enucleated and the behaviour of the residual cytoplasm is studied. ... (18 Nov 1997) ...

merozoite
<biology> Stage in the life cycle of the malaria parasite (Plasmodium): formed during the asexual division of the schizont. Merozoites are released and invade other cells. ... (18 Nov 1997) ...

merozygote
<microbiology> A bacterium that is in part haploid and in part diploid because it has acquired exogenous genetic material for example during transduction or conjugation. ... (18 Nov 1997) ...

merphalan
The racaemic mixture of melphalan and medphalan; an antineoplastic agent. ... Synonym: sarcolysine. ... (05 Mar 2000) ...

merrf syndrome
<syndrome> One of the mitochondrial encephalomyopathies characterised by myoclonic epilepsy and ragged red fibres of muscle tissue. Red muscle tends to be rich in mitochondria. Biochemical tests disclose changes in the enzymes of the respiratory chain. ... (12 Dec 1998) ...

Merrifield
R. Bruce, U.S. Biochemist and Nobel laureate, *1921. ... See: Merrifield synthesis. ... (05 Mar 2000) ...

Merrifield knife
A long, narrow, triangularly shaped knife used in gingival surgery. ... (05 Mar 2000) ...

Merrifield synthesis
The synthesis of peptides and proteins via an automated system on carrier polymers. ... (05 Mar 2000) ...

Merritt
Katharine K., U.S. Paediatrician, *1886. ... See: Kasabach-Merritt syndrome. ... (05 Mar 2000) ...

mersalyl
<chemical> (3-((2-(carboxylatomethoxy)benzoyl)amino)-2-methoxypropyl)hydroxymercurate(1-) sodium. A toxic thiol mercury salt formerly used as a diuretic. It inhibits various biochemical functions, especially in mitochondria, and is used to study those functions. ... Pharmacological action: diuretics, mercurial, enzyme inhibitors, sulfhydryl re …

mery
<plant biology> The number of parts per whorl that characterises a particular flower (generally constant for the perianth whorls and less often for the whorl of stamens also). ... (09 Oct 1997) ...

Mery's gland
Synonym for bulbourethral gland ... One of two small compound racemose glands, that produce a mucoid secretion, lying side by side along the membranous urethra just above the bulb of the corpus spongiosum; they discharge through a small duct into the spongy portion of the urethra. ... Synonym: glandula bulbourethralis, Cowper's gland, Mery's gland.
Merzbacher
Ludwig, German physician in Argentina, 1875-1942. ... See: Merzbacher-Pelizaeus disease, Pelizaeus-Merzbacher disease. ... (05 Mar 2000) ...

Merzbacher-Pelizaeus disease
Synonym for Pelizaeus-Merzbacher disease ... A sudanophilic leukodystrophy with a tigroid appearance of the myelin resulting from patchy demyelination. Type 1-classic, nystagmus and tremor appearing in the first few months of life, followed by slow motor development sometimes with choreoathetosis, spasticity, optic atrophy and seizures, with death i …

mes-
1. <prefix> A combining form denoting in the middle, intermediate; specif. ... 2. <chemistry> Denoting a type of hydrocarbons which are regarded as methenyl derivatives. Also used adjectively. ... Origin: Gr. In the middle. ... (29 Oct 1998) ...

mesad
Passing or extending toward the median plane of the body or of a part. ... Synonym: mesiad. ... Origin: G. Mesos, middle, + L. Ad, to ... (05 Mar 2000) ...

mesal
Rarely used term referring to the median plane of the body or a part. ... Origin: G. Mesos, middle ... (05 Mar 2000) ...

mesalamine
<chemical> An anti-inflammatory agent, structurally related to the salicylates, which is active in inflammatory bowel disease. It is considered to be the active moiety of sulphasalazine. ... Pharmacological action: non-steroidal anti-inflammatory agents. ... (12 Dec 1998) ...

mesameboid
Minot's term for a primitive, 'wandering' cell derived from mesoderm, probably a haemocytoblast. ... Origin: mes-+ G. Amoibe, change (amoeba), + eidos, resemblance ... (05 Mar 2000) ...

mesangial
Referring to the mesangium. ... (05 Mar 2000) ...

mesangial cell
<pathology> Cells found within the glomerular lobules of mammalian kidney, where they serve as structural supports, may regulate blood flow, are phagocytic and may act as accessory cells, presenting antigen in immune responses. ... (18 Nov 1997) ...

mesangial nephritis
Glomerulonephritis with an increase in glomerular mesangial cells or matrix, or mesangial deposits. ... (05 Mar 2000) ...

mesangium
A central part of the renal glomerulus between capillaries; mesangial cells are phagocytic and for the most part separated from capillary lumina by endothelial cells. ... Origin: mes-+ G. Angeion, vessel ... Extraglomerular mesangium, mesangial cells that fill the triangular space between the macula densa and the afferent and efferent arterioles of t …

mesaortitis
Inflammation of the middle or muscular coat of the aorta. ... Origin: mes-+ aortitis ... (05 Mar 2000) ...

mesareic
Mesaraic ... Synonym: mesenteric. ... Origin: G. Mesaraion, mesentery, fr. Mesos, middle, + araia, flank, belly ... (05 Mar 2000) ...

mesarteritis
Inflammation of the middle (muscular) coat of an artery. ... Origin: mes-+ arteritis ... (05 Mar 2000) ...

mesatipellic
Mesatipelvic ... Denoting an individual with a pelvic index between 90 and 95; the superior strait has a round appearance, with the transverse diameter longer than the anteroposterior by 1 cm or less. ... Origin: G. Mesatos, midmost, + pellis, a bowl (pelvis) ... (05 Mar 2000) ...

mesatipellic pelvis
An obsolete term for one in which the anteroposterior and transverse diameters are equal or the transverse diameter is not more than 1 cm longer than the anteroposterior diameter. ... Synonym: round pelvis. ... (05 Mar 2000) ...

mesaxon
The plasma membrane of the neurolemma that is folded in to surround a nerve axon. In electron micrographs this double layer resembles a mesentery in appearance. ... (05 Mar 2000) ...

mescal buttons
The dried slices of the cactus Lophophora williamsii containing mescaline and related alkaloids. ... (05 Mar 2000) ...

mescaline
<chemical> 3,4,5-trimethoxyphenethylamine. Hallucinogenic alkaloid isolated from the flowering heads (peyote) of lophophora (formerly anhalonium) williamsii, a mexican cactus used in indian religious rites and as an experimental psychotomimetic. Among its cellular effects are agonist actions at some types of serotonin receptors. It has no acc …

mesectic
An obsolete term denoting a specimen of blood that has a normal percentage saturation of oxygen at any given pressure. ... Origin: mes-+ G. Echo, to have ... (05 Mar 2000) ...

mesectoderm
1. Cells in the area around the dorsal lip of the blastopore where mesoderm and ectoderm undergo a process of separation. ... 2. That part of the mesenchyme derived from ectoderm, especially from the neural crest in the cephalic region in very young embryos. ... Synonym: ectomesenchyme. ... Origin: mes-+ ectoderm ... (05 Mar 2000) ...

mesencephalic flexure
Synonym for cephalic flexure ... The sharp, ventrally concave bend in the developing midbrain of the embryo. ... Synonym: cerebral flexure, cranial flexure, mesencephalic flexure. ... (05 Mar 2000) ...

mesencephalic tegmentum
That major part of the substance of the mesencephalon or midbrain that extends from the substantia nigra to the level of the cerebral aqueduct. ... Synonym: tegmentum mesencephali, tegmentum, midbrain tegmentum. ... (05 Mar 2000) ...

mesencephalic veins
Synonym for venae mesencephalicae ... Several veins draining the mesencephalon; the posterior ones are tributaries to the great cerebral vein; the lateral ones are tributaries to the basal vein. ... Synonym: mesencephalic veins. ... (05 Mar 2000) ...

mesencephalitis
Inflammation of the midbrain (mesencephalon). ... (05 Mar 2000) ...

mesencephalotomy
1. <procedure> The sectioning of any structure in the midbrain, especially of the spinothalamic tracts for the relief of intractable pain or the cerebral peduncle for dyskinesias. ... 2. A mesencephalic spinothalamic tractotomy. ... Origin: mesencephalon + G. Tome, incision ... (05 Mar 2000) ...

mesenchymal
Relating to the mesenchyme. ... (05 Mar 2000) ...

mesenchymal cells
Fusiform or stellate cell's found between the ectoderm and endoderm of young embryos; the shape of the cell's in fixed material is indicative of the fact that in life they were moving from their place of origin to areas where they would become reaggregated and specialised; most mesenchymal cell's are derived from established mesodermal layers, but …

mesenchymal epithelium
The flat epithelium derived from mesenchymal cells found lining certain connective tissue spaces such as the anterior chamber of eye, perilymph spaces in the ear, and subdural and subarachnoid spaces. ... (05 Mar 2000) ...

mesenchymal hyloma
<tumour> A neoplasm of tissue derived from the mesoblastic pulp or mesenchyme. ... (05 Mar 2000) ...

mesenchymal tissue
Embryonic connective tissue. ... See: mesenchyme. ... (05 Mar 2000) ...

mesenchyme
<pathology> Embryonic tissue of mesodermal origin. ... (18 Nov 1997) ...

mesenchymoma
A mixed mesenchymal tumour composed of two or more mesodermal cellular elements not commonly associated, not counting fibrous tissue as one of the elements. Mesenchymomas are widely distributed in the body and about 75% are malignant. ... (12 Dec 1998) ...

mesenteric
<anatomy> Pertaining to the mesentery: a membranous fold attaching various organs to the body wall. ... Origin: Gr. Mesenterikos ... (18 Nov 1997) ...

mesenteric adenopathy
<radiology> 4% in Hodgkin's disease, 50% in non-Hodgkin's lymphoma, ** sandwich sign ... (12 Dec 1998) ...

mesenteric arteries
Arteries which arise from the abdominal aorta and distribute to most of the intestines. ... (12 Dec 1998) ...

mesenteric artery occlusion
Obstruction of arterial flow in the mesenteric circulation by an embolus or thrombus; usually refers to occlusion of the superior mesenteric artery, although atherosclerotic narrowing may involve all three major splanchnic branches (coeliac, superior, and inferior mesenteric). ... (05 Mar 2000) ...

mesenteric artery, inferior
The artery supplying nearly all the left half of the transverse colon, the whole of the descending colon, the sigmoid colon, and the greater part of the rectum. It is smaller than the superior mesenteric artery (mesenteric artery, superior) and arises from the aorta above its bifurcation into the common iliac arteries. ... (12 Dec 1998) ...

mesenteric artery, superior
A large vessel supplying the whole length of the small intestine except the superior part of the duodenum. It also supplies the caecum and the ascending part of the colon and about half the transverse part of the colon. It arises from the anterior surface of the aorta below the coeliac artery at the level of the first lumbar vertebra. ... (12 Dec 19 …

mesenteric cyst
A congenital thin-walled cyst of the abdomen between the leaves of the mesentery, which may be of wolffian or lymphatic duct origin. As it enlarges it may cause colicky pain and intestinal obstruction. (dorlamd, 27th ed) ... (12 Dec 1998) ...

mesenteric glands
See: mesenteric lymph nodes. ... (05 Mar 2000) ...

mesenteric hernia
Hernia through a hole in the mesentery. ... (05 Mar 2000) ...

mesenteric lymphadenitis
A condition clinically resembling acute appendicitis, in which there is inflammation of the mesenteric lymph nodes receiving lymph from the intestine. A septal form, which is frequently fatal, and a milder form, which is self-limited, are caused by yersinia (pasteurella) pseudotuberculosis. ... (12 Dec 1998) ...

mesenteric vascular occlusion
Obstruction of the flow in the mesenteric circulation by atherosclerosis, emboli or thrombi, stenosis, trauma, and compression or intrinsic pressure from adjacent tumours. Rare causes are drugs, intestinal parasites, and vascular immunoinflammatory diseases such as periarteritis nodosa and thromboangiitis obliterans. ... (12 Dec 1998) ...

mesenteric veins
Veins which return blood from the intestines; the inferior mesenteric vein empties into the splenic vein, the superior mesenteric vein joins the splenic vein to form the portal vein. ... (12 Dec 1998) ...

mesenteric vessels
<anatomy> Those arteries and veins that supply the small and large intestines. ... (27 Sep 1997) ...

mesentericoparietal fossa
Synonym for parajejunal fossa ... A peritoneal fossa that has been seen in a few cases in which the jejunum has no mesentery but is attached to the posterior parietal peritoneum; the fossa begins at the point where the mesentery ends, and is seen on raising up the knuckle of free intestine. ... Synonym: Broesike's fossa, fossa parajejunalis, mesenter …

mesentericoparietal recess
Synonym for parajejunal fossa ... A peritoneal fossa that has been seen in a few cases in which the jejunum has no mesentery but is attached to the posterior parietal peritoneum; the fossa begins at the point where the mesentery ends, and is seen on raising up the knuckle of free intestine. ... Synonym: Broesike's fossa, fossa parajejunalis, mesenter …

mesentericopeptidase
<enzyme> Serine protease from bacillus mesentericus ... Registry number: EC 3.4.21.- ... Synonym: alkaline mesentericopeptidase, esperase ... (26 Jun 1999) ...

mesenteriolum
A small mesentery, as one of an intestinal diverticulum. ... Synonym: mesoenteriolum. ... Origin: Mod. L. Dim. Of mesenterium, mesentery ... (05 Mar 2000) ...

mesenteriolum processus vermiformis
Synonym for mesoappendix ... The short mesentery of the appendix lying behind the terminal ileum, in which the appendicular artery courses. ... Synonym: mesenteriolum processus vermiformis, mesentery of appendix. ... (05 Mar 2000) ...

mesenteriopexy
Fixation or attachment of a torn or incised mesentery. ... Synonym: mesopexy. ... Origin: mesentery + G. Pexis, fixation ... (05 Mar 2000) ...

mesenteriorrhaphy
Suture of the mesentery. ... Synonym: mesorrhaphy. ... Origin: mesentery + G. Rhaphe, suture ... (05 Mar 2000) ...

mesenteriplication
Reducing redundancy of a mesentery by making one or more tucks in it. ... Origin: mesentery + L. Plico, pp. -atus, to fold ... (05 Mar 2000) ...

mesenteritis
Inflammation of the mesentery. ... (05 Mar 2000) ...

mesenterium
Synonym: mesentery, mesentery. ... Origin: Mod. L. ... (05 Mar 2000) ...

mesenterium dorsale commune
Synonym for mesentery ... 1. <anatomy> The membranes, or one of the membranes (consisting of a fold of the peritoneum and inclosed tissues), which connect the intestines and their appendages with the dorsal wall of the abdominal cavity. The mesentery proper is connected with the jejunum and ilium, the other mesenteries being called mesoccum, m …

mesenteron
<anatomy> All that part of the alimentary canal which is developed from the primitive enteron and is lined with hypoblast. It is distinguished from the stomodum, a part at the anterior end of the canal, including the cavity of the mouth, and the proctodum, a part at the posterior end, which are formed by invagination and are lined with epibla …

mesentery
1. <anatomy> The membranes, or one of the membranes (consisting of a fold of the peritoneum and inclosed tissues), which connect the intestines and their appendages with the dorsal wall of the abdominal cavity. The mesentery proper is connected with the jejunum and ilium, the other mesenteries being called mesoccum, mesocolon, mesorectum, etc …

mesentery of appendix
Synonym for mesoappendix ... The short mesentery of the appendix lying behind the terminal ileum, in which the appendicular artery courses. ... Synonym: mesenteriolum processus vermiformis, mesentery of appendix. ... (05 Mar 2000) ...

mesentery of caecum
Synonym for mesocaecum ... <anatomy> The fold of peritoneum attached to the caecum. The part of the mesocolon, supporting the caecum, that occasionally persists when the ascending colon becomes retroperitoneal during foetal life. ... Synonym: mesentery of caecum. ... Origin: meso-+ caecum ... (05 Mar 2000) ...

mesentery of lung
Synonym for mesopneumonium ... The reflection of pleura surrounding the root of the lung (including the pulmonary ligament inferiorly) as parietal pleura becomes continuous with the visceral pleura of the lung. ... Synonym: mesentery of lung. ... (05 Mar 2000) ...

mesentery of sigmoid colon
See: mesocolon. ... (05 Mar 2000) ...

mesentery of transverse colon
See: mesocolon. ... (05 Mar 2000) ...

mesethmoid bone
In comparative anatomy, the bone present in some species as the most anterior bone of the floor of the braincase. ... (05 Mar 2000) ...

mesh
1. The opening or space inclosed by the threads of a net between knot and knot, or the threads inclosing such a space; network; a net. 'A golden mesh to entrap the hearts of men.' (Shak) ... 2. The engagement of the teeth of wheels, or of a wheel and rack. Mesh stick, a stick on which the mesh is formed in netting. ... Origin: AS. Masc, max, mscre; a …

mesh graft
Synonym for accordion graft ... A skin graft in which multiple slits have been made, so it can be stretched to cover a large area. ... Synonym: mesh graft. ... (05 Mar 2000) ...

meshwork
See: network. ... (05 Mar 2000) ...

mesial
<dentistry> Forward or front. For example your cuspid is medial to you bicuspid. The medial surface of your bicuspid is the part of the bicuspid closest to your cuspid. ... (08 Jan 1998) ...

mesial angle
The angle formed by the meeting of the mesial with the labial (or buccal) or lingual surface of a tooth. ... (05 Mar 2000) ...

mesial caries
Caries on the tooth surface that is directed toward the median plane of the dental arch. ... (05 Mar 2000) ...

mesial displacement
Synonym for mesioversion ... Malposition of a tooth mesial to normal, in an anterior direction following the curvature of the dental arch. ... Synonym: mesial displacement, mesioplacement. ... (05 Mar 2000) ...

mesial occlusion
Occlusion in which the mandibular teeth articulate with the maxillary teeth in a position anterior to normal. ... Synonym: anterior occlusion, mesio-occlusion. ... Synonym: mesioclusion. ... (05 Mar 2000) ...

mesial surface of tooth
The contact surface of a tooth that is directed toward the median plane of the dental arch; opposite to the facies distalis dentis. ... Synonym: facies mesialis dentis. ... (05 Mar 2000) ...

mesic
<ecology> Conditioned by a temperate moist climate, neither xeric nor hydric, pertaining to conditions of medium moisture supply. ... (09 Oct 1997) ...

mesio-
Mesial (especially in dentistry). ... Origin: G. Mesos, middle ... (05 Mar 2000) ...

mesio-occlusal
Denoting the angle formed by the junction of the mesial and occlusal surfaces of a bicuspid or molar tooth. ... (05 Mar 2000) ...

mesio-occlusion
Synonym for mesial occlusion ... Occlusion in which the mandibular teeth articulate with the maxillary teeth in a position anterior to normal. ... Synonym: anterior occlusion, mesio-occlusion. ... Synonym: mesioclusion. ... (05 Mar 2000) ...

mesiobuccal
Relating to the mesial and buccal surfaces of a tooth; denoting especially the angle formed by the junction of these two surfaces. ... (05 Mar 2000) ...