Dissection of thorax from a posterior approach

Deep musculature.

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Image #131-5
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Dissection of thorax from a posterior approach
Deep musculature.
The trapezius and latissimus dorsi muscles have been preserved on the right side. These muscles have been removed on the left and the shoulder girdle has been pulled aside. The posterior serratus muscles have been cut away and the thoracolumbar fascia has been removed to display the erector spinae muscles to the left of the midline. The more delicate, intrinsic fascia of the erector spinae has also been cut away.
1 . Scapula (retracted laterally)
2 . Serratus posterior superior muscle (reflected)
3 . Serratus anterior muscle
4 . Fascia related to serratus anterior muscle
5 . External intercostal muscle
6 . Iliocostalis thoracis muscle
7 . Longissimus thoracis muscle
8 . Spinalis thoracis muscle (6-8 make up the erector spinae muscle)
9 . Dorsal branch thoracic nerve X (lateral cutaneous branch)
10 . Rib XII
11 . Internal abdominal oblique muscle (reflected anteriorly)
12 . Thoracolumbar fascia (cut margin of layer which covered erector spinae)
13 . Spinous process vertebrae Th. II
14 . Trapezius muscle
15 . Latissimus dorsi muscle
16 . Thoracolumbar fascia (intact)
17 . External abdominal oblique muscle
18 . Iliac crest