Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «M»:
Mental retardation, blindness, deafness, seizures
Mental retardation with optic atrophy, deafness & seizures: A disorder first reported in 1999 by Gustavson and colleagues as a newly recognized X-linked mental retardation syndrome. In the family they studied there were 7 male children in 2 generations with the syndrome. The affected males were ...
Mentum: Medical term for the chin. From Latin. See: Chin....
Meralgia paresthetica: Entrapment or pinching of the nerve that supplies sensation to the outer portion of the thigh. The lateral femoral cutaneous nerve becomes entrapped as it passes under the ligament of the groin. The pressure on the nerve causes burning, pain, and numbness over the distribution...
Mercaptopurine: A drug that acts as an antimetabolite, interfering with the metabolism of purine bases and inhibiting the synthesis of DNA and RNA.
Mercaptopurine is used to treat acute lymphoblastic leukemia, acute myeloid leukemia (AML), and polycythemia vera. It is also used in the treatment of ...
Mercury gilding: A perilous process for gold-plating in which an amalgam of mercury and gold is applied to an object and then exposed to heat to vaporize the mercury and leave the gold behind in a thin layer. The risk is mercury poisoning. See: Fire gilding....
Mercury poisoning: The metallic element mercury is poisonous to humans. Mercury poisoning can occur in both acute and chronic forms.
Acute mercury poisoning (which today is less common) is associated with ulcerations of the stomach and intestine and with toxic changes in the renal (kidney) tubules. ...
Merkel cell carcinoma
Merkel cell carcinoma: An infrequent but highly malignant type of skin cancer. Characteristically starts in a sun-exposed area (of the head, neck, arms or legs) in whites 60-80 years of age as a firm, painless, shiny lump that can be red, pink, or blue in color and vary in size from less than a qua...
Merkle cell carcinoma
Merkle cell carcinoma: A rapidly growing type of skin cancer, correctly termed Merkel cell carcinoma, after the German anatomist and pathologist Friedrich Sigmund Merkel (1845-1919)....
Mesenteric artery: One of the arteries which arises from the abdominal portion of the aorta and distributes blood to most of the intestines....
Mesenteric vein: One of the large veins which return blood from the intestines.
The inferior (lower) mesenteric vein empties into the splenic vein. The superior (upper) mesenteric vein then joins the splenic vein to create the portal vein which goes to the liver....
Mesentery: A fold of tissue which attaches organs to
the body wall.
The word mesentery usually refers to the small bowel
mesentery which anchors the small intestine to the back of the
abdominal wall. Blood vessels, nerves, and lymphatics branch
through the mesentery to supply the intestine.
Mesial: 1. Toward the middle. As, for example, a mesial temporal lobe structure.
2. In dentistry, toward the middle of the front of the jaw....
Mesmerism: 1. Originally, a system of therapeutics propounded by Mesmer.
2. A precursor of hypnotism, believed by Mesmer to involve animal magnetism.
3. By extension, the power to fascinate in a way that is almost hypnotic.
The term mesmerism is named after the physician Franz (originally Friedric...
Mesoderm: One of the three primary germ cell layers -- the other two are the ectoderm and endoderm -- in the very early embryo. The mesoderm is the middle layer. It differentiates to gives rise to a number of tissues and structures including bone, muscle, connective tissue, and the middle layer of t...
Mesodermal: Pertaining to the mesoderm or to tissues derived from the mesoderm....