quadratus lumborum

noun
quadratus lum·​bor·​um | \ -ləm-ˈbȯr-əm How to pronounce quadratus lumborum (audio) \

Medical Definition of quadratus lumborum

: a quadrilateral-shaped muscle of the abdomen that arises from the iliac crest and the iliolumbar ligament, inserts into the lowest rib and the upper four lumbar vertebrae, and functions especially to flex the trunk laterally

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