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

melittin
<protein> The major component of bee venom, responsible for the pain of the sting. ... A 26 amino acid peptide, that has a hydrophobic and a positively charged region. Can lyse cell membranes and activate phospholipase A2 enzymes, it has a very high affinity for calmodulin but the biological relevance of this is unclear. ... (13 Nov 1997) ...

melituria
An obsolete term for glycosuria. ... Origin: G. Meli, honey, + ouron, urine ... (05 Mar 2000) ...

melkersson-rosenthal syndrome
<syndrome> A syndrome often beginning in childhood or adolescence, characterised by chronic facial oedema, recurrent peripheral facial paralysis, sometimes fissured tongue, and ophthalmological involvement. It is also called granulomatous cheilitis or cheilitis granulomatosa. ... (12 Dec 1998) ...

Melkersson, Ernst
<person> Swedish physician, 1898-1932. ... See: Melkersson-Rosenthal syndrome. ... (05 Mar 2000) ...

mellitic
<chemistry> Containing saccharine matter; marked by saccharine secretions; as, mellitic diabetes. ... Pertaining to, or derived from, the mineral mellite. ... <chemistry> Mellitic acid, a white, crystalline, organic substance, C6(CO2H)6, occurring naturally in combination with aluminium in the mineral mellite, and produced artificially by …

mellitose
Synonym for raffinose ... <biochemistry, plant biology> A nonreducing trisaccharide found in sugar beet and many seeds, consisting of the disaccharide sucrose bearing a D galactosyl residue linked _(1-6) to its glucose group. ... (18 Nov 1997) ...

mellitum
A pharmaceutical preparation with honey as an excipient. ... Origin: L. Neut. Of mellitus, honeyed ... (05 Mar 2000) ...

Melnick-Needles syndrome
Synonym for osteodysplasty ... A generalised skeletal dysplasia with prominent forehead and small mandible; radiographically, there are irregular ribbon-like constrictions of the ribs and tubular bones; probably autosomal dominant inheritance. There are arguably two forms, autosomal recessive and X-linked. ... Synonym: Melnick-Needles syndrome. ... Or …

Melnick, John
<person> U.S. Radiologist, *1928. ... See: Melnick-Needles syndrome. ... (05 Mar 2000) ...

melocervicoplasty
Plastic surgery of the cheek and neck. ... Origin: melo-+ L. Cervix, neck, + G. Plastos, formed ... (05 Mar 2000) ...

melodidymus
A foetus with a supernumerary limb. ... Origin: melo-+ G. Didymos, twin ... (05 Mar 2000) ...

melodrama
Formerly, a kind of drama having a musical accompaniment to intensify the effect of certain scenes. Now, a drama abounding in romantic sentiment and agonizing situations, with a musical accompaniment only in parts which are especially thrilling or pathetic. In opera, a passage in which the orchestra plays a somewhat descriptive accompaniment, while …

melomania
<psychiatry> An abnormal fascination with or devotion to music. ... Origin: L. Melos, song + mania, frenzy ... (05 Mar 2000) ...

melomelia
A malformation in which the foetus has one or more rudimentary limbs in addition to the normal limbs. ... Compare: micromelia. ... Origin: G. Melos, limb ... (05 Mar 2000) ...

melon
1. <botany> The juicy fruit of certain cucurbitaceous plants, as the muskmelon, watermelon, and citron melon; also, the plant that produces the fruit. ... 2. <zoology> A large, ornamental, marine, univalve shell of the genus Melo. Melon beetle A genus of cactaceous plants (Melocactus) having a fleshy and usually globose stem with the sur …

melon-seed body
A small fibrous loose body in the joints or tendon sheaths. ... (05 Mar 2000) ...

melonoplasty
An obsolete spelling for meloplasty. ... Origin: G. Melon, cheek, + plastos, formed ... (05 Mar 2000) ...

Melophagus
A genus of louse flies (family Hippoboscidae) that includes the ectoparasite of sheep, Melophagus ovinus. ... See: Hippobosca. ... Origin: G. Melon, sheep, + phagein, to eat ... (05 Mar 2000) ...

Melophagus ovinus
A wingless, flattened, hairy, leathery parasitic fly found in the wool of sheep and on goats; it is widespread in sheep, in which it sucks blood and causes much skin irritation. ... Synonym: ked. ... (05 Mar 2000) ...

meloplasty
A surgical procedure designed to reduce the visible signs of aging in the face. Commonly referred to as a facelift. Recovery is typically 2-3 weeks duration. ... (27 Sep 1997) ...

melorheostosis
<radiology> Rare condition of cortical thickening of unknown aetiology most commonly seen in the long bones, 3-59 years, symptoms: usually pain of varying severity, occasionally limited ROM, contracture, insidious onset and chronic course X-ray findings: cortical sclerosis and thickening that may encroach on the medullary canal -- looks like …

melosalgia
Pain in the lower limbs. ... Origin: G. Melos, limb, + algos, pain ... (05 Mar 2000) ...

meloschisis
Congenital cleft in the face. ... Origin: G. Melon, cheek, + schisis, a cleaving ... (05 Mar 2000) ...

melotia
Congenital displacement of the auricle onto the cheek. ... Origin: G. Melon, cheek, + ous, ear ... (05 Mar 2000) ...

melphalan
<chemical> An alkylating nitrogen mustard that is used as an antineoplastic in the form of the levo isomer - melphalan, the racaemic mixture - merphalan, and the dextro isomer - medphalan; toxic to bone marrow, but little vesicant action; potential carcinogen. ... Pharmacological action: antineoplastic agent, alkylating, carcinogens. ... Chemic …

melphan
A toxic chemotherapy agent (a nitrogen mustard compound) used most often to treat myelomas and carcinomas of breast and ovarian tissue. ... (09 Oct 1997) ...

meltdown
<radiobiology> In a fission reactor, if there is insufficient coolant or the fission chain reaction proceeds too rapidly, heat can build up in the reactor fuel, causing it to melt. In extreme cases the whole fission core can melt down to (or even through) the reactor floor. Fusion reactors are not vulnerable to this. ... (09 Oct 1997) ...

melting
Liquefaction; the act of causing (something) to melt, or the process of becoming melted. ... <chemistry> Melting point, the degree of temperature at which a solid substance melts or fuses; as, the melting point of ice is 0 deg Centigrade or 32 deg Fahr, that of urea is 132 deg Centigrade. Melting pot, a vessel in which anything is melted; a cr …

melting point
The temperature at which a solid becomes a liquid, the temperature at which 50% of a macromolecule becomes denatured. ... (05 Mar 2000) ...

melting sign
<radiology> Regression of consolidation from periphery to centre, seen in pulmonary infarction, appears within days to weeks ... (12 Dec 1998) ...

melting temperature
Synonym for temperature midpoint ... The midpoint in the change in optical properties (absorbance, rotation) of a structured polymer (e.g., DNA) with increasing temperature. ... Synonym: melting temperature. ... (05 Mar 2000) ...

melting temperature of DNA
Synonym for denaturation temperature of DNA ... That temperature at which, under a given set of conditions, double-stranded DNA is changed (50%) to single-stranded DNA; under standard conditions, the base composition of the DNA can be estimated from the denaturation temperature, since the greater the denaturation temperature, the greater the guanine …

Meltzer-Lyon test
A test used in diagnosis of gallbladder conditions: 25 ml of a 25% solution of magnesium sulfate are delivered into the region of the sphincter of Oddi through a duodenal tube, causing contraction of the gallbladder, relaxation of the sphincter, and the expulsion of bile from the common duct and gallbladder; bile from the common duct is relatively …

Meltzer, Samuel
<person> U.S. Physiologist, 1851-1920. ... See: Meltzer's law, Meltzer-Lyon test. ... (05 Mar 2000) ...

Meltzer's law
all living functions are continually controlled by two opposite forces: augmentation or action on the one hand, and inhibition on the other. ... Synonym: law of contrary innervation. ... (05 Mar 2000) ...

melzer's reagent
A stain used to study the cellular structure of fungi. ... (09 Oct 1997) ...

MEM
<abbreviation> Eagle's minimum essential medium. ... (05 Mar 2000) ...

memantine
<chemical> 3,5-dimethyltricyclo(3.3.1.1(3,7))decan-1-amine. Amantadine derivative that has some dopaminergic effects. It has been proposed as an antiparkinson agent. ... Pharmacological action: antiparkinson agents, dopamine agents, excitatory amino acid antagonists. ... Chemical name: Tricyclo(3.3.1.13,7)decan-1-amine, 3,5-dimethyl- ... (12 Dec …

member
1. <anatomy> A part of an animal capable of performing a distinct office; an organ; a limb. 'We have many members in one body, and all members have not the same office.' (Rom. Xii. 4) ... 2. Hence, a part of a whole; an independent constituent of a body; as: A part of a discourse or of a period or sentence; a clause; a part of a verse. ... < …

membra
Plural of membrum. ... Origin: L. ... (05 Mar 2000) ...

membrana
Synonym: biomembrane. ... Origin: L. ... (05 Mar 2000) ...

membrana abdominis
Synonym for peritoneum ... <anatomy> The smooth serous membrane which lines the cavity of the abdomen, or the whole body cavity when there is no diaphragm, and, turning back, surrounds the viscera, forming a closed, or nearly closed, sac. ... Alternative forms: peritonaeum. ... Origin: L. Peritoneum, peritonaeum, Gr, fr. To stretch all around or …

membrana adamantina
Synonym for enamel cuticle ... The primary enamel cuticle, consisting of two extremely thin layers (the inner one clear and structureless, the outer one cellular), covering the entire crown of newly erupted teeth and subsequently abraded by mastication; it is evident microscopically as an amorphous material between the attachment epithelium and the …

membrana adventitia
Synonym for adventitia ... The outermost connective tissue covering of any organ, vessel, or other structure not covered by a serosa; instead, the covering is properly derived from without (i.e., from the surrounding connective tissue) and does not form an integral part of such organ or structure. ... Synonym: tunica adventitia, membrana adventitia.< …

membrana basilaris
Synonym for basilar membrane ... A thin layer of tissue covered with mesothelial cells that separates the cochlea from the scala tympani in the ear. ... (18 Nov 1997) ...

membrana capsularis
The hyaloid vascular network around the posterior pole of the lens in the embryo. ... (05 Mar 2000) ...

membrana capsulopupillaris
The lateral portion of the vascular tunic of the lens of the eye in the embryo. ... (05 Mar 2000) ...

membrana carnosa
Synonym for dartos fascia ... A layer of smooth muscular tissue in the integument of the scrotum. ... See: dartos muliebris. ... Synonym: tunica dartos, dartos muscle, membrana carnosa, tunica carnea. ... (05 Mar 2000) ...

membrana cerebri
Any one of the cerebral meninges. ... (05 Mar 2000) ...

membrana choriocapillaris
Synonym for choriocapillary layer ... The internal layer of the choroidea of the eye, composed of a very close capillary network. ... Synonym: lamina choroidocapillaris, choriocapillaris, entochoroidea, lamina choriocapillaris, membrana choriocapillaris, Ruysch's membrane. ... (05 Mar 2000) ...

membrana cordis
Synonym for pericardium ... <anatomy> A double membranous sac which envelops and protects the heart. The layer in contact with the heart is referred to as the visceral layer, the outer layer in contact with surrounding organs is the parietal pericardium. In between the two layers is the pericardial space. ... (27 Sep 1997) ...

membrana cricothyroidea
Synonym for cricothyroid membrane ... <anatomy> An elastic membrane which lies anteriorly in the neck adjacent the cricoid cartilage and the first tracheal ring. This is the membrane which is pierced or incised when performing a cricothyroidotomy. ... (13 Nov 1997) ...

membrana decidua
Synonym for deciduous membrane ... The mucous membrane of the pregnant uterus that has already undergone certain changes, under the influence of the ovulation cycle, to fit it for the implantation and nutrition of the ovum; so-called because the membrane is cast off after labour. ... Synonym: membrana decidua, caduca, decidua, Hunter's membrane. ... ( …

membrana eboris
The lining membrane of the pulp cavity of a tooth, consisting of the odontoblastic layer. ... Synonym: ivory membrane. ... (05 Mar 2000) ...

membrana fibroelastica laryngis
Synonym for fibroelastic membrane of larynx ... A layer of fibrous and elastic fibres, taking the place of the submucosa in the larynx. It is divided by the laryngeal ventricle into two parts: the quadrangular membrane superiorly and the conus elasticus inferiorly. ... Synonym: membrana fibroelastica laryngis. ... (05 Mar 2000) ...

membrana fibrosa
Synonym for fibrous articular capsule ... The outer fibrous part of the capsule of a synovial joint, which may in places be thickened to form capsular ligaments. ... Synonym: membrana fibrosa, stratum fibrosum, fibrous membrane. ... (05 Mar 2000) ...

membrana flaccida
Synonym for flaccid part of tympanic membrane ... Triangular loose part of tympanic membrane between the malleolar folds. ... Synonym: pars flaccida membranae tympani, flaccid membrane, membrana flaccida, Rivinus' membrane, Shrapnell's membrane. ... (05 Mar 2000) ...

membrana fusca
Synonym for lamina fusca of sclera ... An exceedingly delicate layer of loose, pigmented connective tissue on the inner surface of the sclera, connecting it with the choroid. ... Synonym: lamina fusca sclerae, brown layer, membrana fusca. ... (05 Mar 2000) ...

membrana germinativa
Synonym for blastoderm ... In many eggs with a large amount of yolk, cell division (cleavage) is restricted to a superficial layer of the fertilized egg (meroblastic cleavage). This layer is termed the blastoderm. In birds it is a flat disc of cells at one pole of the egg and in insects an outer layer of cells surrounding the yolk mass. ... (18 Nov 1 …

membrana granulosa
Synonym for stratum granulosum folliculi ovarici vesiculosi ... The layer of small cells that forms the wall of an ovarian follicle. ... Synonym: granular layer of a vesicular ovarian follicle, granulosa, membrana granulosa, stratum granulosum ovarii. ... (05 Mar 2000) ...

membrana hyaloidea
Synonym for posterior limiting layer of cornea ... A transparent homogeneous acellular layer between the substantia propria and the endothelial layer of the cornea; considered to be a highly developed basement membrane. ... Synonym: lamina limitans posterior corneae, membrana vitrea, Descemet's membrane, Duddell's membrane, entocornea, hyaloid membra …

membrana hyothyroidea
Synonym for thyrohyoid membrane ... A thin, fibrous, membranous sheet filling the gap between the hyoid bone and the thyroid cartilage. ... Synonym: membrana thyrohyoidea, membrana hyothyroidea. ... (05 Mar 2000) ...

membrana intercostalis externa
Synonym for external intercostal membrane ... The membrane that replaces the external intercostal muscle anteriorly between costal cartilages. ... Synonym: membrana intercostalis externa. ... (05 Mar 2000) ...

membrana intercostalis interna
Synonym for internal intercostal membrane ... The membrane that replaces the internal intercostal muscle posteriorly, medial to the angles of the ribs. ... Synonym: membrana intercostalis interna. ... (05 Mar 2000) ...

membrana interossea antebrachii
Synonym for interosseous membrane of forearm ... The dense membrane that connects the interosseous margins of the radius and ulna, forming the radioulnar syndesmosis, and with the bones separating the flexor and extensor compartments of the forearm. ... Synonym: membrana interossea antebrachii. ... (05 Mar 2000) ...

membrana interossea cruris
Synonym for interosseous membrane of leg ... The dense fibrous layer that connects the interosseous margins of the tibia and fibula, forming the upper portion of the tibiofibular syndesmosis and, with the bones and intermuscular septa, creating anterior and posterior comparments of the leg. ... Synonym: membrana interossea cruris, ligamentum tibiofib …

membrana limitans
Limiting membrane separating the neural parenchyma from the pia and blood vessels. ... See: limiting membrane of retina. ... (05 Mar 2000) ...

membrana limitans gliae
Synonym for glial limiting membrane ... A dense, resilient membrane forming the true capsule of the brain and spinal cord, composed of the processes of astrocytes (macroglia cells) and covered throughout by the pia mater, which firmly adheres to it; the two membranes are collectively called the pial-glial membrane. ... Synonym: membrana limitans glia …

membrana mucosa
Synonym for mucosa ... <pathology> A mucous membrane or tunica mucosa. ... (18 Nov 1997) ...

membrana nictitans
Synonym for plica semilunaris conjunctivae ... The semilunar fold formed by the palpebral conjunctiva at the medial angle of the eye, a fold of the conjunctival mucous membrane found in many animals; normally partially hidden in the medial canthus of the eye when at rest, it may be extended to cover part or all of the cornea in a winking-like action …

membrana obturatoria
Synonym for obturator membrane ... The thin membrane of strong interlacing fibres filling the obturator foramen. ... Synonym: membrana obturatoria. ... (05 Mar 2000) ...

membrana perinei
Synonym for inferior fascia of urogenital diaphragm ... The layer of fascia extending between the ischiopubic rami inferior to the sphincter urethrae and the deep transverse perineal muscles. ... Synonym: membrana perinei, fascia diaphragmatis urogenitalis inferior, Camper's ligament, ligamentum triangulare, perineal membrane, triangular ligament. …

membrana pituitosa
Synonym for nasal mucosa ... The mucous membrane lining the nasal cavity. ... (12 Dec 1998) ...

membrana preformativa
The thickened membrana formed by fusion of Korff's fibres and the basement membrane of the ameloblasts in a developing tooth. ... (05 Mar 2000) ...

membrana pupillaris
Synonym for pupillary membrane ... Remnants of the central portion of the anterior layer of the iris stroma (the iridopupillary lamina) which occludes the pupil in foetal life, and normally atrophies about the seventh month of gestation. Persistent strands usually stretch across the pupil from one iris collarette to the other, without touching the p …

membrana quadrangularis
Synonym for quadrangular membrane ... The elastic fibra membrane that extends from the ventricular fold of the larynx upward to the aryepiglottic fold; it attaches anteriorly to the epiglottis and posteriorly to the lateral margin of the arytenoid and corniculate cartilages. ... Synonym: membrana quadrangularis, Tourtual's membrane. ... (05 Mar 2000)< …

membrana reticularis
Synonym for reticular membrane ... The membrane formed by cuticular plates of the cells of the spiral organ of Corti; it appears netlike when viewed from above. ... Synonym: membrana reticularis. ... (05 Mar 2000) ...

membrana serosa
serosa, chorion ...

membrana serotina
An obsolete synonym of decidua basalis. ... (05 Mar 2000) ...

membrana spiralis
An alternate term for tympanic wall of cochlear duct, tympanic wall of cochlear duct. ... (05 Mar 2000) ...

membrana stapedis
Synonym for stapedial membrane ... The delicate mucosal layer that bridges the space between the crura and base of the stapes. ... Synonym: membrana stapedis. ... (05 Mar 2000) ...

membrana statoconiorum
Synonym for statoconial membrane ... A gelatinous membrane supported by the hairs of the hair cells of the maculae of the saccule and utriculus of the inner ear; adhering to the surface are numerous crystalline particles called statoconia. ... Synonym: membrana statoconiorum, otolithic membrane. ... (05 Mar 2000) ...

membrana sterni
Synonym for sternal membrane ... Interlacing fibres from the anterior costosternal ligaments covering the anterior surface of the sternum. ... Synonym: membrana sterni. ... (05 Mar 2000) ...

membrana striata
Synonym for zona striata ... The thickened cell membrane of the ovum in forms, such as certain amphibia, in which it appears radially striated under the light microscope; with the electron microscope the striations can be seen to be microvilli. ... Synonym: membrana striata, striated membrane, zona radiata. ... (05 Mar 2000) ...

membrana succingens
Synonym for pleura ... <anatomy> The serous membranes covering the lungs (visceral pleura) and lining the inner aspect of the pleural cavity (parietal pleura). ... (29 Oct 1998) ...

membrana suprapleuralis
Synonym for suprapleural membrane ... The thickened portion of endothoracic fascia extending over the cupola of the pleura and reinforcing it; it attaches to the inner border of the first rib and to the transverse process of the seventh cervical vertebra. ... Synonym: membrana suprapleuralis, Sibson's aponeurosis, Sibson's fascia. ... (05 Mar 2000) …

membrana synovialis
Synonym for synovial membrane ... The inner of the two layers of the articular capsule of a synovial joint, composed of loose connective tissue and having a free smooth surface that lines the joint cavity. It secretes the synovial fluid. ... (12 Dec 1998) ...

membrana tectoria
Synonym for tectorial membrane ... A gelatinous membrane, attached to the bony spiral lamina, which overlies the hair cells within the cochlea of the inner ear. ... (12 Dec 1998) ...

membrana tectoria ductus cochlearis
Synonym for tectorial membrane of cochlear duct ... A gelatinous membrane that overlies the spiral organ (Corti) in the inner ear. ... Synonym: membrana tectoria ductus cochlearis, Corti's membrane, tectorium. ... (05 Mar 2000) ...

membrana tensa
Synonym for tense part of the tympanic membrane ... The greater portion of the tympanic membrane which is tense and firm, contrasting with the small triangular flaccid part of tympanic membrane. ... Synonym: pars tensa membranae tympani, membrana tensa, membrana vibrans. ... (05 Mar 2000) ...

membrana thyrohyoidea
Synonym for thyrohyoid membrane ... A thin, fibrous, membranous sheet filling the gap between the hyoid bone and the thyroid cartilage. ... Synonym: membrana thyrohyoidea, membrana hyothyroidea. ... (05 Mar 2000) ...

membrana tympani
Synonym for tympanic membrane ... <anatomy> The eardrum. ... (13 Nov 1997) ...

membrana tympani secundaria
Synonym for secondary tympanic membrane ... The membrane closing the fenestra cochleae or rotunda. ... Synonym: membrana tympani secundaria, Scarpa's membrane. ... (05 Mar 2000) ...

membrana versicolor
Synonym for tapetum ... 1. <cell biology> Layer of reflective tissue just behind the pigmented retinal epithelium of many vertebrate eyes. May consist either of a layer of guanine crystals or a layer of connective tissue. In bovine eyes reflects a blue green iridescent colour. ... 2. <plant biology> Layer of cells in the sporangium of a v …

membrana vestibularis
Synonym for vestibular membrane ... The membrane separating the cochlear duct from the vestibular canal; it consists of squamous epithelial cells with microvilli toward the ductus, a basement membrane, and a thin layer of connective tissue toward the scala. ... Synonym: membrana vestibularis, paries vestibularis ductus cochlearis, Reissner's membrane …

membrana vibrans
Synonym for tense part of the tympanic membrane ... The greater portion of the tympanic membrane which is tense and firm, contrasting with the small triangular flaccid part of tympanic membrane. ... Synonym: pars tensa membranae tympani, membrana tensa, membrana vibrans. ... (05 Mar 2000) ...

membrana vitellina
The membrane enveloping the yolk; specifically, the thickened cell membrane of large-yolked ova. ... Synonym: ovular membrane, vitelline membrane. ... Sometimes used to designate the zona pellucida of a mammalian ovum. ... Synonym: yolk membrane. ... (05 Mar 2000) ...

membrana vitrea
Synonym for posterior limiting layer of cornea ... A transparent homogeneous acellular layer between the substantia propria and the endothelial layer of the cornea; considered to be a highly developed basement membrane. ... Synonym: lamina limitans posterior corneae, membrana vitrea, Descemet's membrane, Duddell's membrane, entocornea, hyaloid membra …

membranae intercostalia
Synonym for intercostal membranes ... The membranous layers between ribs. ... Synonym: membranae intercostalia, intercostal ligaments, ligamenta intercostalia. ... (05 Mar 2000) ...

membranate
Of the nature of a membrane. ... (05 Mar 2000) ...