The remains of the cavity of the allantois which usually disappears during embryonic development.
Greek ouron = urine, and echein = to hold, hence the canal connecting the bladder and umbilicus in the foetus.
MS = The urinary canal of the fetus; postnatally it is usually a fibrous cord but occasionally persists as a vesicoumbilical fistula. AN = a fetal canal connecting the bladder with the allantois; patent urachus: index under URACHUS /abnorm: do not confuse with URACHAL CYST UI = D014497
A fibrous cord that connects the urinary bladder to the umbilicus (navel). The urachus is formed as the allantoic stalk during fetal development and lasts through life. Also called the median umbilical ligament.
Structure that during fetal life transports the foals urine into the placental fluids; it normally closes off after birth.
The vesico-urethral portion of the urogenital sinus absorbs the ends of the Wolffian ducts and the associated ends of the renal diverticula, and these give rise to the trigone of the bladder and part of the prostatic urethra.
