Info

1. Latissimus dorsi muscle

2. Iliocostalis muscle (part of erector spinae muscle)

3. Longissimus muscle (part of erector spinae muscle)

4. Transversospinales muscles

5. Ilium

6. Sacroiliac joint

7. Sacrum (lateral part or mass of sacrum)

8. Sacral nerves

9. Rectum (ampulla)

10. Gluteus maximus muscle

11. Levator ani muscle

12. External anal sphincter muscle

13. Interspinal ligaments

14. Spinalis muscle (part of erector spinae muscle)

15. Spinous process

16. Dorsal sacroiliac ligament

17. Spinal canal

19. Superior gluteal artery and vein

20. Piriformis muscle

21. Inferior gluteal artery, vein, and nerve

22. Ischioanal fossa

23. Gluteal lymph nodes

24. Pararectal lymph nodes

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