Venous System
During prenatal life, there are three venous systems:
1) The vitelline system >>> develops into the portal system.
2) The cardinal system >>> forms the caval system.
3) The umbilical system >>> disappear after birth and forms the ligamentum teres hepatise (remains of the left umbilical vein) and ligamentum venosum (remains of the ductus venosus).
1) The vitelline system >>> develops into the portal system.
2) The cardinal system >>> forms the caval system.
3) The umbilical system >>> disappear after birth and forms the ligamentum teres hepatise (remains of the left umbilical vein) and ligamentum venosum (remains of the ductus venosus).
Development of the vitelline and umbilical veind during the (A) 4th , (B) 5th weeks, (C) second and (D) third months. In (A) and (B) note the plexus around the duodenum, formation of the hepatic sinusoid, and initiation of left-to-right shunts between the vitelline veins. In (C) and (D) note formation of the ductus venosus, portal vein, and hepatic portion of the inferior vena cava. The splenic and superior mesenteric veins enter the portal vein (Sadler 2010).