Yolk stalk

Yolk stalk
A narrow tube present in the early embryo that connects the midgut of the embryo to the yolk sac outside the embryo through the umbilical opening. Later in development, the yolk stalk is usually obliterated, but a remnant of it may persist: most commonly as a finger-like protrusion from the small intestine known as Meckelís diverticulum. Found in 2 to 4 percent of people, Meckelís diverticulum may become inflamed (much like the appendix) and require surgical removal. Also known as the omphalomesenteric duct, umbilical duct, or vitelline duct.

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the narrow duct connecting the yolk sac with the midgut of the early embryo; it becomes partly incorporated into the embryo and usually undergoes complete obliteration, although part may persist as a diverticulum from the small intestine (ileal or Meckel diverticulum). Called also omphaloenteric, umbilical, or vitelline duct.

Medical dictionary. 2011.

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Look at other dictionaries:

  • yolk stalk — n. a short, thick, tubular stalk between the embryo and the yolk sac …   English World dictionary

  • yolk stalk — yolk′ stalk n. dvl a tubular connection between the yolk sac and the embryonic gut in the developing embryo • Etymology: 1895–1900 …   From formal English to slang

  • yolk stalk — noun : the narrow tubular stalk connecting the yolk sac with the embryo * * * a tubular connection between the yolk sac and the embryonic gut in the developing embryo. [1895 1900] * * * yolk stalk, a narrow, ductlike part that unites the yolk sac …   Useful english dictionary

  • yolk stalk — noun Date: 1900 the narrow tubular stalk connecting the yolk sac with the embryo …   New Collegiate Dictionary

  • yolk stalk — a tubular connection between the yolk sac and the embryonic gut in the developing embryo. [1895 1900] * * * …   Universalium

  • yolk stalk — n. (Medicine) narrow tube that connects the yolk sac with the midgut of the embryo …   English contemporary dictionary

  • Yolk sac — Not all yolk has to do with birds’ eggs. Human embryos have a yolk sac, a membrane 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 for …   Medical dictionary

  • yolk sac — noun 1. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional • Syn: ↑vitelline sac, ↑umbilical vesicle, ↑vesicula umbilicus • Hypernyms: ↑sac 2. membranous structure enclosing the… …   Useful english dictionary

  • yolk sac — noun Date: 1861 a membranous sac of most vertebrates that encloses the yolk, is attached in most forms (as in humans) through the yolk stalk with the intestinal cavity of the embryo, and is supplied with blood vessels that transport nutritive… …   New Collegiate Dictionary

  • stalk — A narrowed connection with a structure or organ. allantoic s. the narrow connection between the intraembryonic portion of the allantois and the extraembryonic allantoic vesicle …   Medical dictionary

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