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Quadratus Lumborum
Region: Back Muscles · All back muscles
Quadratus Lumborum at a glance
| Origin | Iliac crest and iliolumbar ligament |
|---|---|
| Insertion | Twelfth rib and transverse processes of L1–L4 |
| Actions | Tilts the trunk to the same side; Fixes the twelfth rib during breathing; Both sides extend the lumbar spine |
| Nerve supply | Ventral rami of T12 and L1–L4 |
◆ Good to know
The 'hip hiker': it lifts the pelvis on the swinging side during walking, and it stabilises the last rib so the diaphragm can work.
More Back Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.