Quadratus lumborum muscle
Musculus quadratus lumborum
- Synonym: Quadrate lumbar muscle
Definition
The quadratus lumborum muscle (quadratus lumborum) is a flat, quadrilateral muscle located between the iliac crest and the last rib, deep to the epaxial muscles and the psoas major (when present).
Origin: Bodies of the last three thoracic vertebrae to the transverse processes of the lumbar vertebrae as far as the seventh lumbar vertebra.
Insertion: Medial surface of the wing of the ilium between the articular surface and the caudal ventral iliac spine.
Action: Fixation of the lumbar vertebral column.
Nerve: Rami of the ventral branches of the lumbar nerves.
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