Anatomy
| Origin | Iliac crest, iliolumbar ligament |
| Insertion | Inferior border of rib 12, transverse processes of vertebrae L1-L4 |
| Innervation | Subcostal nerve (T12), anterior rami of spinal nerves L1-L4 |
| Blood supply | Lumbar, median sacral, iliolumbar and subcostal arteries |
| Function | Bilateral contraction – fixes Ribs 12 during inspiration, trunk extensionUnilateral contraction – lateral flexion of trunk (ipsilateral) |
Stretching
Bryson Ingram R.M.T. 