Medical Dictionary Terms Beginning with Y

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Yersinia pestis

Yersinia pestis: The bacterial cause of the bubonic plague which in the year 541 (as the Black Death) and later in the Middle Ages decimated Europe. The effects of the plague are described in the nursery rhyme &We all fall down.& It is trans
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Y-linked

Y-linked: A gene on the Y chromosome. A Y-linked gene is by necessity passed from father to son.
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Y-linked inheritance

Y-linked inheritance: Inheritance by genes on the Y chromosome. Also called holandric inheritance.
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Yogurt

Yogurt: A common dish made of milk curdled and fermented with a culture of Lactobacillus (the milk bacillus). The word was acquired in the 1620s from Turkey. It can be spelled myriad ways including yogurt, yoghurt, yaghourt, yooghurt, yughard, and yao
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Yolk sac

Yolk sac: Not all yolk has to do with birds’ eggs. Human embyros have a yolk sac, a membane outside the embryo but connected by a tube (the yolk stalk) though the umbilical opening to the embryo’s midgut. The yolk sac serves as an early site
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Yolk stalk

Yolk stalk: A narrow tube present in the early embryo that connects the midgut of the embryo (through the umbilical opening) to the yolk sac outside the embryo. Later in development, the yolk stalk is usually obliterated but a remnants of it may persi
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Youth

Youth: The time between childhood and maturity. (Unfortunately, as the songwriter Sammy Cahn noted, &youth is wasted on the young.&)
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