urachus

(ū′ră-kŭs )

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[Gr. ourachos, fetal urinary canal]
A transient embryonic structure, the tube connecting the top of the developing bladder and the umbilical cord. It is derived from the allantois of the embryo. Postnatally it becomes filled with cells and in the adult remains only as a ligamentous cord (median umbilical ligament).

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