In the fetus, canal connecting the bladder and toe allantois; it remains in toe adult as an umbilical ligament.
The remains of the cavity of the allantois, which usually disappears during embryonic development. In the adult it normally exists in the form of a solid fibrous cord connecting the bladder with the umbilicus, but it may persist abnormally as a patent duct.
A corded structure which extends from the bladder up to the navel, and represents the remains of the canal which in the fetus joins the bladder with the allantois.
The tube-like formation that links the urinary bladder to the allantois, a prenatal membrane that extends from the yolk sac and plays a role in creating the umbilical cord and placenta. Following birth, the urachus remains as a fibrous cord positioned between the apex of the bladder and the navel.