Extrapyramidal system
Extrapyramidal system: The part of the nervous system that regulates muscle reflexes.
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- Extrasystole
Extrasystole: A premature contraction of the heart that is independent of the normal rhythm of the heart and that arises in response to an impulse in some part of the heart other than the normal impulse from the sinoatrial (SA) node. The extrasystole is followed by a pause, as the heart electrical system “resets” itself […]
- Extrauterine
Extrauterine: Outside the uterus (the womb). As opposed to intrauterine: inside the uterus. For example, normal pregnancies are intrauterine; extrauterine pregnancies can occur in the uterine tube or abdominal cavity. These are distinctly abnormal and dangerous.
- Extrauterine pregnancy
Extrauterine pregnancy: A pregnancy that is not in the usual place and is located outside the inner lining of the uterus. A fertilized egg settles and grows in any location other than the inner lining of the uterus. The large majority (95%) of extrauterine pregnancies occur in the Fallopian tube. However, they can occur in […]
- Extravasate
Extravasate: To exude from or pass through the walls of a vessel into the surrounding tissues. Blood, lymph, or urine can extravasate. From the Latin “extra” (out of) + “vas” (vessel) = out of a vessel.
- Extremely low birth weight (ELBW) baby
Extremely low birth weight (ELBW) baby: A baby born very prematurely weighing between 401 and 1000 grams (about 14 to 35 ounces) at birth. Extremely low birth weight (ELBW) babies are at the lower limits of viability. If ELBW babies survive, they are at elevated risk for neurological abnormalities, hearing and visual impairment, and developmental […]