Urachus

Urachus -

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 into a solid cord, a functionless remnant.

Failure for the lumen of the urachus to be filled in
leaves a patent (open) urachus. The telltale sign is leakage of urine through the umbilicus. A patent urachus needs to be surgically removed.



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