<prompt> Vitelline vein formsLigamentum venosumLigamentum teresPoal veinCoronary sinus  <response>: Inderbir SinghsHuman embryology Tenth edition Pg 265 The pas of right and left vitelline that lie outside the substance of the liver undergo alterations leading to formation of poal vein 2 vitelline veins shows anastomosis before opening into sinus venosus that is 1dorsal and 2 ventral proximal and distal. At dorsal anastomosis spleenic and superior mesentric vein joins vitelline vein poal vein is formed by:Dorsal anastomosis ventral anastomosis Right vitelline vein 