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

Components of erector spinae muscle separated, general view

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Image #213-5

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

Components of erector spinae muscle separated, general view

The heavy aponeurosis of origin of the left erector spinae has been partially removed near the midline. This portion of the aponeurosis, form which the longissimus thoracic part arises, also serves to give attachment to portions of the underlying multifidus muscle (8). The iliocostalis (2, 6), longissimus (4) and spinalis (5) muscles have been separated from each other.

1. Rib II
2. Iliocostalis muscle
3. Rib VI
4. Longissimus thoracis muscle
5. Spinalis thoracis muscle
6. Iliocostalis lumborum muscle
7. Internal oblique muscle
8. Multifidus muscle
9. Spinous process vertebra Th. III
10. Trapezius muscle
11. Latissimus dorsi muscle
12. Spinous process vertebra Th. XII
13. Thoracolumbar fascia (posterior layer)
14. Iliac crest
15. Gluteus maximus muscle