Webster's New World Medical Dictionary

Magendie, foramen of
See 
foramen of
Magendie.
magnesium
A mineral that is involved in many
processes in the body, including nerve signaling, the
building of healthy bones, and normal muscle con-
traction. All unprocessed foods contain magnesium.
High concentrations of magnesium are found in
nuts, unmilled grains, and legumes, such as peas
and beans. See also 
deficiency, magnesium; mag-
nesium excess.
magnesium deficiency
See 
deficiency,
magnesium.
magnesium excess
Too much magnesium in the
body. Persons with impaired kidney function should
be especially careful about their magnesium intake
because they can accumulate dangerous levels of
magnesium. Also known as hypermagnesemia. See
also 
magnesium.
magnetic resonance imaging
A procedure that
uses magnetism, radio waves, and a computer to
create pictures of areas inside the body. Abbreviated
MRI. An MRI is painless and has the advantage of
avoiding x-ray radiation exposure. There are no
known risks of an MRI. The benefits of an MRI
relate to its precise accuracy in detecting structural
abnormalities of the body. Patients with heart pace-
makers, metal implants, or metal chips or clips in
or around the eyes cannot be scanned with MRI
because of the effect of the magnet.
Maimonides’ Daily Prayer of a Physician
See
Daily Prayer of a Physician.
maintenance therapy
Treatment designed to
help the original primary treatment to succeed.
Maintenance therapy may be given to patients who
macula
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have cancer that is in remission to prevent a
relapse.
major
In general, something that is more than
something else. For example, the teres major mus-
cle is larger than the teres minor muscle.