1 — Superior articular process; 2 — Ilium; 3 — Interosseous sacro-iliac ligament; 4 — Sacro-iliac joint; 5 — Anterior sacro-iliac ligament; 6 — Sacrum [sacral vertebrae SI-SV]; 7 — Acetabular fossa; 8 — Body of pubis; 9 — Iliopubic eminence; 10 — Linea terminalis; 11 — Pubic tubercle; 12 — Pubic symphysis; 13 — Levator ani; Pubococcygeus; 14 — Obturator canal; 15 — Levator ani; Iliococcygeus; 16 — Tendinous arch of levator ani; 17 — Rectococcygeus; 18 — Ischiococcygeus; Coccygeus; 19 — Greater sciatic foramen; 20 — Sacrotuberous ligament;
21 — Anterior sacrococcygeal ligament
