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
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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