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Bassett Collection of Stereoscopic Images of Human Anatomy

Dissection of male pelvis from a lateral approach

Obturator internus muscle and nerve supply, medial view

Image #172-7

KEYWORDS: Muscles and tendons, Peripheral nervous system.

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Dissection of male pelvis from a lateral approach
Obturator internus muscle and nerve supply, medial view
The pelvic diaphragm has been removed from the specimen and the obturator fascia has been stripped away.
  1. Iliac branch of iliolumbar artery
  2. Iliac crest
  3. Obturator internus muscle
  4. Obturator nerve
  5. Iliopsoas muscle
  6. Obturator artery
  7. Superior pubic ramus
  8. Pubic symphysis (sectioned)
  9. Pubic arcuate ligament
  10. Inferior pubic ramus
  11. Ramus of ischium
  12. Ramus communicans (to sacral nerve I)
  13. Lumbosacral trunk
  14. Sacral nerve I (ventral ramus)
  15. Sympathetic trunk (pointer on ganglion)
  16. Anterior (pelvic) sacral foramen (pointer indicates opening within sacral canal exposed by cutting through sacrum)
  17. Rami communicantes
  18. Left pointer: Sacral nerve II Right pointer: Sacral nerve III
  19. Sacrum
  20. Piriform muscle
  21. Inferior gluteal artery
  22. Sacral nerve IV
  23. Upper pointer: Inferior rectal nerve Lower pointer: Pudendal nerve
  24. Upper pointer: Branch of sacral nerve III to posterior femoral cutaneous nerve Lower pointer: Sciatic nerve
  25. Nerve to obturator internus muscle (indicated in two places)
  26. Coccygeus muscle
  27. Location of ischial spine
  28. Coccyx
  29. Internal pudendal artery
  30. Sacrotuberous ligament (cut off at attachment)
  31. Ischial tuberosity