Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «M»:
Menangle virus: A virus that causes a disease first found in a piggery near Sydney, Australia in 1997. The virus was highly contagious, moving between pigs in different pens and sheds. It caused numerous deformed and stillborn piglets with abnormalities of the central nervous system. The virus also ...
Menarche: The time in a girl's life that
menstruation first begins. During the menarche period, menstruation
may be irregular and unpredictable. Mood, weight, activity level, and
growth rate may fluctuate with the hormone levels as well. Synonymous
with female puberty. ...
Mendel, Gregor: The great Moravian/Bohemian biologist (1822-84) who set forth the basic laws that constitute the foundation of classical genetics. Mendelian inheritance is the manner in which genes and traits are passed from parents to their children. The modes of Mendelian inheritance are autosoma...
Mendelian: Referring to the great Moravian/Bohemian biologist Gregor Mendel (1822-84) who set forth the basic laws that constitute the foundation of classical genetics. Mendelian inheritance is the manner in which genes and traits are passed from parents to their children. The modes of Mendelian in...
Mendelian inheritance: The manner in which genes and traits are passed from parents to their children. The four modes of Mendelian inheritance are autosomal dominant, autosomal recessive, X-linked dominant and X-linked recessive.
The term "mendelian" refers to the great Austrian biologist Gregor Men...
Mendelism: The principles of genetics, specifically of single-gene traits, based on the work of Gregor Mendel (1822-84), a Moravian monk and biologist who established the laws that are the foundation of classical genetics.
Mendel lived in an Augustinian monastery where teaching and research were e...
Menetrier disease: See: Giant hypertrophic gastritis....
Menetrier's disease: See: Giant hypertrophic gastritis....
Meniere disease: A condition with recurrent vertigo
accompanied by ringing in the ears (tinnitus) and deafness. Symptoms
include vertigo, dizziness, nausea, vomiting, loss of hearing (in the
affected ear), and abnormal eye movements.
Meniere disease is due to dysfunction of the semi-circular can...
Meninges: The three membranes that cover the brain
cord (singular: meninx). The outside meninx is called the dura mater, and is
the most resilient of the three. The center layer is the arachnoid membrane and
the thin innermost layer is the pia mater. Inflammation of the meninges
Meningioma: A common type of slow growing, usually benign brain tumor that arises from the dura, one of the meninges, the membranes covering the brain and spinal cord. A meningioma may occur wherever there is dura but the most common sites are over the cerebral hemispheres of the brain. It is the on...
Meningitis: Inflammation of the meninges,
usually due to a bacterial infection but sometimes from
viral, protozoan, or other causes (in some cases the cause
cannot be determined).
The onset is usually rapid (acute), and
if untreated, the disease can be fatal within a very short
period of time....
Meningitis vaccine: This term usually refers to a vaccine used to prevent meningococcal meningitis, an inflammation of the membranes that cover the brain and spinal cord due to bacterial infection by Neisseria meningitidis.
The CDC's Advisory Committee on Immunization Practices in 1999 made a unanim...
Meningitis, aseptic: Inflammation of the meninges
that is not caused by bacterial infection. Viral
meningitis is the most common cause of aseptic meningitis,
but other causes include systemic lupus erythematosus,
cancers, Behcet's disease, medications, and others. See
also meningitis, viral....
Meningitis, bacterial: Inflammation of the
meninges due to a bacterial infection. Haemophilus influenzae type b (Hib) was the leading cause of bacterial meningitis before the 1990s, but new vaccines given to children as part of their routine immunizations have reduced the occurrence of invasive dis...