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Medical Dictionary     M
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  • M
    Abbreviation for meta-2.
  • M concentration
    the maximum number of bacterial cells that can be produced in a unit volume of growth medium.
  • M line
    a fine line in the center of the A band of the sarcomere of striated muscle myofibrils.

    Alternate names: M band, mesophragma

  • M proteins

    M proteins: Antibodies or parts of antibodies found in unusually large amounts in the blood or urine of multiple myeloma patients.

  • M shell
    the lowest energy level at which electron transitions give rise to x-rays.
  • Ménétrier disease
    gastric mucosal hyperplasia, either mucoid or glandular; the latter type may be associated with the Zollinger-Ellison syndrome.

    Alternate names: giant hypertrophy of gastric mucosa, hypertrophic gastritis, Ménétrier syndrome

  • mèche
    A strip of gauze or other material used as a tent or drain.
  • Möbius sign
    impairment of ocular convergence in Graves disease.
  • Möbius syndrome
    a developmental bilateral facial paralysis usually associated with oculomotor or other neurological disorders.

    Alternate names: congenital facial diplegia

  • Mönckeberg arteriosclerosis
    arterial sclerosis involving the peripheral arteries, especially of the legs of older people, with deposition of calcium in the medial coat (pipestem arteries) but with little or no encroachment on the lumen.

    Alternate names: medial arteriosclerosis, Mönckeberg calcification, Mönckeberg degeneration, Mönckeberg medial calcification, Mönckeberg sclerosis

  • Mörner test
  • Müller fibers
    sustentacular neuroglial cells of the retina, running through the thickness of the retina from the internal limiting membrane to the bases of the rods and cones where they form a row of junctional complexes.

    Alternate names: circular fibers

    Alternate names: Müller radial cells, sustentacular fibers of retina

  • Müller fixative
    a hardening fixative composed of potassium dichromate, sodium sulfate, and distilled water, similar to Regaud fixative.
  • Müller law
    each sensory receptor organ and its nerve fiber receive and transmit just one modality of sensation, regardless of how it is stimulated; moreover, each type of sensation depends not on any special character of the different sensory nerves, but instead on the part of the brain in which their impulses terminate.

    Alternate names: law of specific nerve energies

  • Müller maneuver
    after a forced expiration, an attempt at inspiration is made with closed mouth and nose or closed glottis, whereby the negative pressure in the chest and lungs is made very subatmospheric; the reverse of Valsalva maneuver.
  • Müller radial cells
  • Müller sign
    in aortic insufficiency, rhythmical pulsatory movements of the uvula, synchronous with the heart's action; accompanied by swelling and redness of the velum palati and tonsils.
  • Müller trigone
    the floor of the supraoptic recess of the third ventricle.
  • Müller tubercle
    a median protuberance projecting into the embryonic urogenital sinus from its dorsal wall; it is formed from the fused caudal ends of the paramesonephric ducts and is the first evidence of the embryonic uterus and vagina.

    Alternate names: sinus tubercle

  • müllerian
    Attributed to or described by Johannes Müller.
  • müllerian adenosarcoma
    a tumor of the uterus or ovaries, of low-grade malignancy, composed of benign-appearing glands and a sarcomatous stroma.
  • müllerian inhibiting substance
    a 535–amino acid glycoprotein secreted by the Sertoli cells of the testis. It is related to inhibin.

    Alternate names: anti-müllerian hormone, müllerian inhibiting factor

  • müllerian regression factor
    a nonsteroidal substance of fetal testicular origin that acts unilaterally to inhibit development of the paramesonephric ducts and acts with testosterone to promote development of the ductus deferens and related structures.
  • M'Naghten rule
    the classic English test of criminal responsibility (1843): “to establish a defense on the ground of insanity, it must be clearly proved that, at the time of committing the act, the party accused was laboring under such a defect of reasoning, from disease of the mind, as not to know the nature and quality of the act he was doing, or if he did know it, that he did not know he was doing what was wrong.”
  • m-
  • m-chloral
    A polymer of chloral obtained by prolonged contact with sulfuric acid; it has properties similar to those of chloral hydrate.

    Alternate names: metachloral, p-chloral, trichloral

  • m-cone
    Middle wavelength sensitive cone (green cone).
  • m-cresol
    A local antiseptic with a higher germicidal power than phenol and less toxicity to tissues; used in disinfectants and fumigants; its acetate derivative is used as a topical antiseptic and fungicide.

    Alternate names: metacresol

  • M-CSF
    Abbreviation for macrophage colony-stimulating factor.
  • M-mode
    A diagnostic ultrasound presentation of the temporal changes in echoes in which the depth of echo-producing interfaces is displayed along one axis with time (T) along the second axis; motion (M) of the interfaces toward and away from the transducer is displayed.

    Alternate names: TM-mode

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