Origin, insertion of quadratus lumborum muscle?
What is the position of quadratus lumborum muscle?
Action of quadratus lumborum muscle?
Relation of quadratus lumborum muscle with thoracolumbar fascia?
Muscles of posterior abdominal wall?

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Source of images:
1. COMPLETE ANATOMY, www.3d4medical.com
2. Gray's Atlas Of Anatomy 2nd Edition.