Muscle of the Month (December): Quadratus Lumborum

Posted on January 17th, 2007, by relax

The quadratus lumborum or the ‘QL’ for short, is an extensor of the lumbar vertebrae, bilaterally, and a lateral flexor unilaterally.  It functions in respiration by securing the 12th rib.  It is anchored to the pelvic bone and to each vertebrae of the lumbar spine, on both sides of the body.  When you move one hip up as in the motion of holding a baby on one side, you are using the Quadratus Lumborum on that side of your spine. 

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