allantoic stalk
the slender tube interposed between the urogenital sinus and allantoic sac in the embryo; its intraembryonic part is the precursor of the urachus.

Medical dictionary. 2011.

Look at other dictionaries:

  • 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

  • allantoic duct — see under stalk …   Medical dictionary

  • allantoic veins — paired vessels arising from the dorsal aorta that accompany the allantois; they enter the connecting stalk of the early embryo with the allantois and later form the umbilical veins …   Medical dictionary

  • Urachus — A canal connecting the bladder of the fetus with the allantois, a structure that contributes to the formation of the umbilical cord. The lumen (inside) of the urachus is normally obliterated during embryonic development, transforming the urachus… …   Medical dictionary

  • fold — 1. A ridge or margin apparently formed by the doubling back of a lamina. SYN: plica. 2. In the embryo, a transient elevation or reduplication of tissue in the form of a lamina …   Medical dictionary

  • urachus — n. portion of the allantoic stalk between the apex of the bladder and the umbilicus …   English contemporary dictionary

  • median umbilical ligament — A fibrous cord that connects the urinary bladder to the umbilicus (navel). The median umbilical ligament is formed as the allantoic stalk during fetal development and lasts through life. Also called urachus …   English dictionary of cancer terms

  • urachus — A fibrous cord that connects the urinary bladder to the umbilicus (navel). The urachus is formed as the allantoic stalk during fetal development and lasts through life. Also called median umbilical ligament …   English dictionary of cancer terms

  • Diverticulum — A small bulging sac pushing outward from the colon wall is a diverticulum. As a person ages, pressure within the large intestine (colon) causes pockets of tissue (sacs) that push out from the colon walls. The plural is diverticula. Diverticula… …   Medical dictionary

  • human embryology — ▪ biology Introduction       the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth.       The human body, like that of most animals, develops from a single cell produced by the union of… …   Universalium

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