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        静脉导管 venous duct

        互联网

        654
        即阿兰蒂氏静脉导管（ductus venosus Aran-tii）。是哺乳类胎儿期连接肝脏而产生的静脉。当家囊或胎盘发达后，从尿囊或胎盘来的一部分血液，自尿膜静脉（ allantoic vein）即脐静脉（ umbilicalvein），通过此静脉导管直接进入后大（或下腔）静脉。而其余部分的血液，则不经过静脉导管，而是经肝门静脉汇合于后大（或下腔）静脉。静脉导管随着尿囊和胎盘的发育而增大，但是，胎儿出生后，随着尿囊和胎盘机能的消失，静脉导管退化。在鸟类胚胎上，亦将相当于静脉导管的器官称为静脉导管。

         

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