1 — Appendicular vein; 2 — Ileocolic vein; 3 — Right colic vein; 4 — Pancreaticoduodenal veins; 5 — Right gastro-omental vein; Right gastroepiploic vein; 6 — Superior mesenteric vein; 7 — Right gastric vein; 8 — Hepatic portal vein; 9 — Inferior vena cava; 10 — Left gastric vein;
11 — Left colic flexure; Splenic flexure; 12 — Splenic vein; 13 — Inferior mesenteric vein; 14 — Left colic vein; 15 — Middle colic vein;
16 — Descending colon; 17 — Sigmoid veins; 18 — Sigmoid colon; 19 — Superior rectal vein
