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The quadratus lumborum muscle is a muscle of the posterior abdominal wall lying deep inside the abdomen and dorsal to the iliopsoas. It is the deepest muscle of the posterior abdominal wall, and it is often mistakenly referred to as one of the muscles of the back. Its shape is irregular, but is generally quadriangular, which is the reason why it is described as 'quadratus' in latin.
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The quadratus lumborum muscle is a muscle of the posterior abdominal wall lying deep inside the abdomen and dorsal to the iliopsoas. It is the deepest muscle of the posterior abdominal wall, and it is often mistakenly referred to as one of the muscles of the back. Its shape is irregular, but is generally quadriangular, which is the reason why it is described as 'quadratus' in latin.
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