Dissection of male pelvis from a lateral approach

Sacral plexus and pelvic diaphragm, medial view with blood vessels removed

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Image #172-6

Dissection of male pelvis from a lateral approach

Sacral plexus and pelvic diaphragm, medial view with blood vessels removed

The arteries and veins have been removed from the central area of dissection to expose the sacral plexus as it passes through the greater sciatic foramen.

1. Iliolumbar artery
2. Psoas major muscle
3. Iliacus muscle
4. Obturator nerve
5. Femoral nerve
6. Linea terminalis
7. Ductus deferens (cut off)
8. External iliac artery and vein (passing downward deep to inguinal ligament)
9. Obturator artery
10. Pubic symphysis (sectioned)
11. Obturator internus muscle (covered by obturator fascia)
12. Tendinous arch pelvic fascia
13. Urethra (opened)
14. Urogenital diaphragm (dissected)
15. Lumbosacral trunk
16. Lateral sacral artery
17. Superior gluteal artery
18. Sympathetic trunk (pointer on ganglion)
19. Left pointer: Greater sciatic foramen Right pointer: Sciatic nerve
20. Sacrum (partially resected)
21. Sacral nerve III (ventral ramus)
22. Piriformis muscle
23. Sacral nerve IV
24. Upper pointer: Inferior gluteal artery Lower pointer: Internal pudendal artery
25. Nerve to Levator ani muscle
26. Coccygeus muscle
27. Levator ani muscle
28. Anal canal