What function does the Quadratus Lumborum (QL) muscle serve?

The Quadratus Lumborum (QL) muscle plays a crucial role in maintaining spinal stability and posture. It is located in the lower back, connecting the lumbar vertebrae to the iliac crest of the pelvis. Its primary function involves keeping the spine erect by providing support and stability to the lumbar region, which is essential for proper alignment and weight distribution during various activities.

In addition to maintaining an upright posture, the QL assists with lateral flexion of the spine, allowing for bending to the side. While other muscles may flex the hip or rotate the spine, the unique positioning and function of the QL specifically contribute to stabilizing the pelvis and supporting the lumbar spine, which is imperative for functional movement and overall stability of the trunk during various activities.