The quadratus lumborum is a deep muscle located in the lower back on both sides of the spine. It is a large and powerful muscle responsible for several important functions. The quadratus lumborum helps stabilize and support the spine, particularly during movements such as bending, twisting, and side-bending. It also assists in maintaining proper posture and alignment of the trunk. Additionally, the quadratus lumborum plays a role in respiration, helping to stabilize the ribcage during breathing.
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