Systemic veins develop from 3 main venous systems:
1) Vitelline venous system (Yellow)
2) Umbilical venous system (Red)
3) Cardinal venous system (Blue) - Anterior (SVC side), Posterior (IVC side)
Others:
Subcardinal veins - Green
Sacrocardinal vein - Purple
Hepatocardinal channel - Orange
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