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.
n. 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. —urachal adj.
Health Encyclopedia