这个词是什么意思？
An embryonic structure originating from the ALLANTOIS. It is a canal connecting the fetal URINARY BLADDER and the UMBILICUS. It is normally converted into a fibrous cord postnatally. When the canal fails to be filled and remains open (patent urachus), urine leaks through the umbilicus.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014497 · MeSH 2026。
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