1 — Left internal pudendal vein; 2 — Left middle rectal vein; 3 — Left obturator vein; 4 — Left inferior gluteal vein; 5 — Left superior gluteal vein; 6 — Superior rectal vein; 7 — Sigmoid veins; 8 — Left common iliac vein; 9 — Inferior mesenteric vein; 10 — Hepatic portal vein;
11 — Abdominal aorta; 12 — Median sacral artery; 13 — Inferior vena cava; 14 — Median sacral vein; 15 — Levator ani; 16 — Left inferior rectal
vein
