Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «V»:
Vocal tremor: Trembling or shaking of one or more of the muscles of the larynx (the voice box), resulting in an unsteady sounding voice....
Vohwinkel syndrome: A genetic disorder characterized by hearing loss and thickened skin, particularly on the knuckles. The sensorineural hearing is mild-to-moderate in degree. The thickening of the skin (hyperkeratosis) can be "mutilating" and cause autoamputation of the digits. The syndrome is inhe...
Voice box: The voice box, or larynx, is the portion of the
respiratory (breathing) tract containing the vocal cords which
produce sound. It is located between the pharynx and the trachea. The
larynx, also called the voice box, is a 2-inch-long, tube-shaped
organ in the neck.
We use the larynx...
Voice disorder: One of a group of problems involving abnormal pitch, loudness, or quality of the sounds produced by the larynx (the voice box)....
Void: To urinate. Just as we can void a check and empty it
of value, so can we void our bladder and empty it of urine....
Voiding cystourethrogram: A test done to examine the bladder and urethra while the bladder fills and empties. A radiopaque liquid (that can be seen on x-ray) is placed in the bladder through a catheter. The bladder is filled until the patient urinates. Radiographs (x-rays) are usually taken before, ...
Voiding cystourethrography: A procedure done to examine the bladder and urethra while the bladder fills and empties. A radiopaque liquid (that can be seen on x-ray) is placed in the bladder through a catheter. The bladder is filled until the patient urinates. Radiographs (x-rays) are usually taken b...
Volar: Pertaining to both the palm and sole. It comes from word "vola" which the ancient Romans used for "the palm of the hand and the sole of the foot."
By comparison, the term "palm" applies to only the palm (the grasping side) of the hand. The Romans actually used the word "palma" for the outstr...
Volume, stroke: The amount of blood pumped by the left ventricle of the heart in one contraction.
The stroke volume is not all of the blood contained in the left ventricle. The heart does not pump all the blood out of the ventricle. Normally, only about two-thirds of the blood in the ventricle is pu...
Voluntary: Done in accordance with the conscious will of the individual. The opposite of involuntary.
The terms "voluntary" and "involuntary" apply to the human nervous system and its control over muscles. The nervous system is divided into two parts -- somatic and autonomic. The somatic nervous sys...
Voluntary Euthanasia Society (VES)
Voluntary Euthanasia Society (VES): The first society of its kind in the world -- its founders included doctors, lawyers and churchmen -- the VES was set up in England in 1935. The announced aim of the VES is to make it legal for a competent adult suffering unbearably from an incurable illness to re...
Volvulus: Abnormal twisting of the intestine which can impair the blood flow to the intestine. Volvulus can lead to gangrene and death of that segment of the gastrointestinal tract, intestinal obstruction, perforation of the intestine, and peritonitis. The stomach, small intestine, cecum, and sigmoi...
Vomer: A triangular bone in the nasal septum. The bone
was so named because it was thought to look like a ploughshare, the part of the
plow that cuts the furrow. Vomer is the Latin word for ploughshare....
Vomit: Matter from the stomach that has come up into and may be ejected beyond the mouth, due to the act of vomiting.
When vomit is reddish or the color of coffee grounds, it may mean there is serious internal bleeding. The reddish color may herald fresh blood and dark blood may betoken blood that ...
Vomiting in pregnancy, excess
Vomiting in pregnancy, excess: Medically known as hyperemesis gravidarum, this is excessive vomiting in early pregnancy. By definition, hyperemesis gravidarum, leads to the loss of 5% or more of the body weight of the woman.
Hyperemesis gravidarum affects about one in every 300 pregnant women. It ...