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Dissection of male pelvis from a lateral approach

Relation of pelvic diaphragm to urogenital diaphragm and sphincter ani externus muscle

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Image #169-2
Bassett Image
Diagram Image
Legend Image
Dissection of male pelvis from a lateral approach
Relation of pelvic diaphragm to urogenital diaphragm and sphincter ani externus muscle
The internal pudendal artery has been divided and removed. The urogenital diaphragm has been retracted downward to expose the anterior border of the levator ani muscle. The manner in which the fibers or origin of the levator ani muscle blend with the obturator fascia (4) along the lateral pelvic wall may be observed in this specimen.
  1. Tendinous arch of levator ani muscle
  2. Acetabulum
  3. Acetabular labrum
  4. Obturator fascia
  5. Obturator nerve
  6. Periosteum
  7. Body of pubic bone (dissected)
  8. Sacrospinous ligament
  9. Internal pudendal artery (cut off)
  10. Ischial spine
  11. Coccygeus muscle
  12. Perineal branch of sacral nerve IV
  13. Anococcygeal ligament
  14. Coccyx
  15. Iliococcygeus muscle
  16. Pubococcygeus muscle
  17. Puborectalis muscle (15-17 make up the levator ani muscle)
  18. Deep part
  19. Superficial part
  20. Subcutaneous part (18-20 are part of the external anal sphincter)
  21. Central tendon of perineum
  22. Superior fascia of urogenital diaphragm (pulled downward)
  23. Urethra (opened)