Skip to Content
Medical Term:

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

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.