点击图片查看原图
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
%B0%FC%D3%AE%CD%B8%CA%D3%B6%FE%D5%C5%C5%C6%D1%A5%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%B0%FC%D3%AE%CD%B8%CA%D3%B6%FE%D5%C5%C5%C6%D1%A5%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%B0%FC%D3%AE%CD%B8%CA%D3%B6%FE%D5%C5%C5%C6%D1%A5%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%B0%FC%D3%AE%CD%B8%CA%D3%B6%FE%D5%C5%C5%C6%D1%A5%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
