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胚胎时期是通过胎盘、脐带与母体连接并由母体供血。由于胎儿在母体内有两套循环系统,即母体的血液通过胎盘毛细血管网、脐静脉进入胎儿体内(肝脏),而胎儿自身也有一套完整的循环系统(肝静脉→下腔静脉→右心房→右心室→肺动脉→肺毛细血管网→肺静脉→左心房→左心室→主动脉→全身动脉系统→全身毛细血管网→全身静脉系统→上、下腔静脉→右心房),其血液又通过髂内静脉、脐动脉、胎盘毛细血管网进入母体体内,参与母体的血液循环。
Embryonic period is through the placenta, umbilical cord connected with the mother by the mother and blood supply. Because the fetus in the mother’s body has two sets of circulatory system, the maternal blood through the placental capillary network, umbilical vein into the fetus (liver), while the fetus itself also has a complete circulatory system (hepatic vein → inferior vena cava → right atrium → right ventricle → pulmonary artery → pulmonary capillary network → pulmonary vein → left atrium → left ventricle → aorta → systemic arterial system → systemic capillary network → systemic venous system → superior and inferior vena cava → right atrium) Internal veins, umbilical arteries, placental capillary network into the maternal body, involved in maternal blood circulation.