quadratus lumborum (muscle)
Definition: 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.
Synonym(s): musculus quadratus lumborumTA, lumbar quadrate muscle, quadrate muscle of loins
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