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

Quadratus lumborum muscle, posterior view

For permissions information regarding the use of these images, please contact Drew Bourn at dbourn@stanford.edu

Image #214-6
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Dissection of thoracic and lumbosacral regions of back from a posterior approach
Quadratus lumborum muscle, posterior view
The middle layer of thoracolumbar fascia has been removed from the posterior surface of the quadratus lumborum muscle (7). Small slips of origin join the quadratus lumborum from the transverse processes of the second and third lumbar vertebrae.
1 . Lumbocostal ligament
2 . Rib XII
3 . Subcostal nerve
4 . Left pointer: Dorsal branch lumbar artery II Right pointer: Dorsal branch lumbar nerve II
5 . Transverse process of vertebra L. III
6 . Thoracolumbar fascia (anterior layer)
7 . Quadratus lumborum muscle
8 . Iliolumbar ligament
9 . Posterior superior iliac spine
10 . Spinous process vertebra Th. XII
11 . Supraspinous ligament
12 . Intertransverse muscles
13 . Dorsal branch lumbar nerve II
14 . Erector spinae muscle (covered by thoracolumbar fascia)
15 . Intervertebral joint capsule L. III-IV
16 . Lamina (arch of vertebra) L. V