Meatus
An opening or a passageway. For example, the meatus of the ear is the opening to the ear canal.
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- Mechanical ventilation
Use of a machine called a ventilator or respirator to improve the exchange of air between the lungs and the atmosphere.
- Meatus, female urethral
The meatus (opening) of the female urethra, the transport tube that leads from the bladder to discharge urine outside the body. The female urethral meatus is above the vaginal opening.
- 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 with the colon (the large intestine). A Meckel’s diverticulum can […]
- Meconium
Dark, sticky material that is normally present in the intestine at birth and passed in the feces after birth, after trypsin and other enzymes from the pancreas have acted on it. 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. Meconium ileus results from a deficiency of trypsin and other digestive enzymes from the pancreas, as in cystic fibrosis.