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Exploration of gluteal region and hip

Piriformis and obturator muscles, posterior view of right side

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Image #181-4
Bassett Image
Diagram Image
Legend Image
Exploration of gluteal region and hip
Piriformis and obturator muscles, posterior view of right side
This dissection has been photographed to illustrate the relations of the piriformis and the obturator internus and externus muscles to the capsule of the hip joint and to the bony pelvis and femur.
  1. Median sacral crest
  2. Sacral horn
  3. Coccygeal horn
  4. Superficial posterior sacrococcygeal ligament
  5. Coccyx bone
  6. Sacrotuberous ligament (cut off)
  7. Sacrospinous ligament
  8. Nerve to obturator internus muscle
  9. Obturator internus muscle
  10. Ischial tuberosity
  11. Body of pubis
  12. Quadratus femoris muscle (cut off)
  13. Hip articular capsule
  14. Iliopsoas muscle (tendon of insertion)
  15. Lesser trochanter
  16. Infrapiriform foramen
  17. Piriform muscle
  18. Ilium
  19. Tubercle of iliac crest
  20. Upper pointer: Tendon of obturator internus muscle Lower pointer: Inferior gemellus muscle (note absence of a superior gemellus muscle)
  21. Greater trochanter
  22. Tendon of insertion of obturator externus muscle
  23. Quadrate tubercle
  24. Neck of femur
  25. Trochanter tertius