脐带横断面示意图. 展示了脐动脉(Umbilical arteries)、脐静脉(Umbilical vein)、脐尿管(Allantoic duct)等结构的解剖关系。图片来源:路易斯·巴里奥斯的《哺乳动物的脐带组织学》
母亲与婴儿的血液在胎盘发生交
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