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

Rotator, interspinal and intertransverse muscles in lumbar region

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Image #214-5

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

Rotator, interspinal and intertransverse muscles in lumbar region

The erector spinae and multifidus muscles have been nearly completely excised from the lumbar region.

1. Medial intertransverse muscle
2. Lateral intertransverse muscle (several fascicles present)
3. Dorsal branch thoracic nerve XII
4. Rib XII
5. Aponeurosis transversus abdominis muscle
6. Thoracolumbar fascia (upper pointer, middle layer; lower pointer, posterior layer, cut off)
7. Transversus abdominis muscle
8. Quadratus lumborum muscle (covered by thoracolumbar fascia)
9. Upper pointer: Longissimus muscle Lower pointer: Iliocostalis lumborum muscle
10. Iliac crest
11. Superior cluneal nerves
12. Gluteus medius muscle
13. Gluteus maximus muscle
14. Posterior superior iliac spine
15. Spinous process vertebra L. II
16. Intervertebral joint capsule
17. Interspinalis lumborum muscle
18. Transverse process of vertebra L. IV
19. Thoracolumbar fascia (posterior layer)
20. Rotator muscles
21. Spinous process vertebra L. V
22. Upper pointer: Lamina (arch of vertebra) L. V Lower pointer: Intervertebral joint capsule L. V - S. I
23. Arch sacrum