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

Deep dissection of iliocostalis lumborum and longissimus thoracic muscles; multifidus muscle

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Image #214-2
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Dissection of thoracic and lumbosacral regions of back from a posterior approach
Deep dissection of iliocostalis lumborum and longissimus thoracic muscles; multifidus muscle
The upper parts of the iliocostalis and longissimus have been cut away to expose the lower fascicles of these muscles as they pass deeply. The iliocostalis lumborum has strong insertions on the angles of the lower ribs. The longissimus spreads somewhat to insert into ribs, transverse processes, and accessory processes of the lumbar vertebrae.
1 . Serratus posterior inferior muscle (insertions, cut off)
2 . Iliocostalis lumborum muscle
3 . Rib XII
4 . Transversus abdominis muscle
5 . Subcostal nerve
6 . Thoracolumbar fascia (cut off)
7 . Quadratus lumborum muscle
8 . Superior cluneal nerves
9 . Posterior superior iliac spine
10 . Spinalis thoracis muscle
11 . Longissimus thoracis muscle
12 . Spinous process vertebra L. II
13 . Multifidus muscle
14 . Thoracolumbar fascia