Dissection of thoracic and lumbosacral regions of back from a posterior approach

Erector spinae muscle, close-up view of lumbosacral portion

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Image #213-4

Dissection of thoracic and lumbosacral regions of back from a posterior approach

Erector spinae muscle, close-up view of lumbosacral portion

The posterior layer of thoracolumbar fascia (9)has been cut away on the left to reveal the erector spinae muscle.

1. Iliocostalis lumborum muscle (insertion)
2. Longissimus thoracis muscle
3. Spinalis thoracis muscle
4. Serratus posterior inferior muscle (cut off near insertion into tenth rib)
5. Lateral cutaneous branch of dorsal branch thoracic nerve X
6. Rib XII
7. Internal oblique muscle (reflected anteriorly)
8. Transverse abdominis muscle (aponeurosis of origin)
9. Thoracolumbar fascia (cut across)
10. Erector spinae muscle
11. Superior cluneal nerves
12. Latissimus dorsi muscle
13. Thoracolumbar fascia (posterior layer)
14. External oblique muscle
15. Lumbar triangle (Petit's)
16. Iliac crest
17. Gluteus medius muscle
18. Gluteus maximus muscle