1 – Hepatic portal vein; 2 – Splenic vein; 3 – Left colic vein; 4 – Inferior mesenteric vein; 5 – Sigmoid veins; 6 – Superior rectal vein
1 – Hepatic portal vein; 2 – Splenic vein; 3 – Left colic vein; 4 – Inferior mesenteric vein; 5 – Sigmoid veins; 6 – Superior rectal vein