quadratus lumborum (muscle)

(redirected from quadrate muscle of loins)
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quad·ra·tus lum·bo·rum (mus·cle)

flat muscle of posterior abdominal wall; origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves.