urachus

urachus /ura·chus/ (u´rah-kus) a fetal canal connecting the bladder with the allantois, persisting throughout life as a cord (median umbilical ligament).u´rachal

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u·ra·chus (yr-ks)

n.

The portion of the reduced allantoic stalk between the apex of the bladder and the umbilicus.

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ura·chal adj.

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urachus

a fetal canal connecting the bladder with the allantois via the navel. It mostly disappears in the neonatal period although a nipple-like projection may remain on the bladder and in some species a cord may persist along the cranial border of the median ligament of the bladder.

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persistent urachus

failure of the urachus to obliterate at birth so that urine dribbles from it continuously. The urine may also be passed from the urethra. Retrograde infection from an omphalitis is common, resulting in cystitis. Called also pervious urachus.