From the case:
Quadratus lumborum muscle



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The diagrams show the quadratus lumborum muscle and its relations to adjacent structures.
Other muscles are demonstrated: erector spinae group, psoas major, external oblique muscle, internal oblique muscle, transversus abdominis muscle.
Case Discussion
Source: Wikipedia
Orginal files:
- https://en.wikipedia.org/wiki/File:Quadratuslumborum.png
- https://en.wikipedia.org/wiki/File:Gray388.png
- https://en.wikipedia.org/wiki/File:Gray1124.png
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