最終更新日：2024/08/01
The urachus is a tube-like structure that connects the bladder to the umbilicus.
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The urachus is a tube-like structure that connects the bladder to the umbilicus.
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The urachus is a tube-like structure that connects the bladder to the umbilicus.
The urachus is a tube-like structure that connects the bladder to the umbilicus.
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