Dissection of thorax from a posterior approach

Deep musculature.

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Image #131-4
Bassett ImageDiagram Image
Legend Image
Dissection of thorax from a posterior approach
Deep musculature.
The serratus posterior inferior has been severed near the midline where its origin blends with the thoracolumbar fascia. Its four component muscle bands (2) have been reflected upward close to their costal insertions. The branches of intercostal nerves to the two central portions of the muscle have been dissected, while those to the upper and lower fascicles are not shown.
1 . Rib X
2 . Serratus posterior inferior muscle (four pointers indicate individual costal insertions of this muscle)
3 . External intercostal muscle
4 . Branches of intercostal nerve X (to serratus posterior inferior muscle)
5 . Branch intercostal artery X
6 . Rib XII
7 . External abdominal oblique muscle
8 . Thoracolumbar fascia (cut across)
9 . Spinous process vertebrae Th. XII
10 . Dorsal branch thoracic nerve X (lateral cutaneous branch)
11 . Iliocostalis lumborum muscle (covered by intrinsic muscle fascia)