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The allantois is a structure that collects the waste that the embryo produces before it hatches.
The urachus is a remnant of allantoic origin, connecting the embryonal cloaca to the allantois during early intrauterine life.
In the fetus, the urachus connects the bladder with the allantois .
Initially, the bladder is continuous with the allantois .
Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois , yolk sac, and chorion.
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