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
urachus
u·ra·chus (y r  -ks)n. The portion of the reduced allantoic stalk between the apex of the bladder and the umbilicus. u ra·chal adj. |
urachus
[yo̅o̅r′əkəs]
Etymology: Gk, ourachos, urinary tract
in the fetus, an epithelial tube connecting the apex of the urinary bladder with the umbilicus. It persists throughout life as the median umbilical ligament.
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.
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.
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