1 — Perineal vein; 2 — Vesical venous plexus; 3 — Obturator internus; 4 — Obturator canal; 5 — Cord of umbilical artery; 6 — Obturator vein; 7 — Vesical veins; 8 — Inferior epigastric vein; 9 — Inferior epigastric artery; 10 — External iliac artery; 11 — External iliac artery; 12 — Obturator nerve; 13 — Iliacus; 14 — Right common iliac artery; 15 — Right common iliac vein; 16 — Internal iliac vein; 17 — Lumbosacral trunc; 18 — Superior gluteal vein; 19 — Lateral sacral vein; 20 — Median sacral vein; 21 — Piriformis; 22 — Inferior gluteal veins; 23 — Middle rectal vein; 24 — Ischiococcygeus; Coccygeus; 25 — Internal pudendal vein; 26 — Iliococcygeus; 27 — Inferior rectal veins; 28 — Pubococcygeus
