Quadratus Lumborum
The quadratus lumborum or QL is a common cause of back pain which is to one side and comes on after lifting or twisting.
Origin
- Posterior iliac crest.
- Iliolumbar ligament.
Insertion
- Twelfth rib.
- Transerve processes of L1-L4.
Actions
- Lateral flexion (side-bends) of the trunk.
Innervation
- Ventral rami of the subcostal nerve.
- Lumbar nerves.
Daily uses
- Bending sideways to pick something up.
