Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «M»:
Meckel's diverticulum: An outpouching from the small
intestine, due to failure of obliteration of the yolk stalk (which normally disappears during embryonic life). About 2% of people have a Meckel's diverticulum. It is usually located about 2 feet (60 cm) above the junction of the small intestine ...
Meconium: Dark sticky material normally present in the intestine
at birth and passed in the feces after birth. The passage of meconium before birth can be
a sign of fetal distress. ...
Meconium ileus: Obstruction of
the intestine (ileus) due to overly thick meconium, the
dark sticky stuff that is normally present in the intestine
at birth and, after trypsin and other enzymes from the
pancreas have acted on it, is normally passed in the feces
after birth. Meconium ileus resu...
MECP2 (methyl-CpG-binding protein-2)
MECP2 (methyl-CpG-binding protein-2): An enzyme which, when mutated, results in RTT (Rett syndrome), a genetic disease that is a uniform and striking, progressive neurologic developmental disorder and one of the most common causes of mental retardation in females.
After normal development up to the ...
Med school: Short informal term for medical school. (Medical schools are not often called med schools by medical students.) See: Medical school....
Med-school syndrome: See: Medical school syndrome....
Med1 DNA repair gene
Med1 DNA repair gene: A gene that codes for one of the key enzymes involved in repairing DNA. The DNA in genes is constantly mutating and being repaired. This repair process is controlled by special genes. A mutation in a DNA repair gene such as Med1 can cripple the repair process and cause a cascad...
Media, contrast: X-ray dyes used to provide contrast, for example, between blood vessels and other tissue. Commonly spoken of as "contrast."...
Medial: 1. Pertaining to the middle; in or toward the middle; nearer the middle of the body. Medial is as opposed to lateral. For example, the medial side of the knee is the side closest to the other knee whereas the lateral side of the knee is the outside of the knee.
2. Within a multilayered struc...
Medial collateral ligament (MCL) of the knee
Medial collateral ligament (MCL) of the knee: The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ligaments). These ligaments provide stability and strength to the knee join...
Medial meniscus of the knee
Medial meniscus of the knee: The word "meniscus" refers to a crescent-shaped structure. The medial meniscus of the knee is a thickened crescent-shaped cartilage pad between the two joints formed by the femur (the thigh bone) and the tibia (the shin bone). The meniscus acts as a smooth surface for th...
Medial occipitotemporal gyrus
Medial occipitotemporal gyrus: See: Lingual gyrus....
Median: The middle. Like the median strip in a highway. ...
Mediastinoscopy: A procedure in which the doctor inserts a tube
into the chest to view the organs in the mediastinum. The tube is inserted through an
incision above the breastbone. ...
Mediastinotomy: A procedure
in which the doctor inserts a tube into the chest to view the organs in the mediastinum. The tube
is inserted through an incision next to the breastbone. ...