Musculus quadratus lumborum

Origin:


 * iliac crest (+ ligaments between crista and spine),
 * lumbar vertebrae

Insertion: 12th;ribs and LI-LIV

Innervation:


 * nervus subcostalis,
 * fibers fromlumbar plexus.

Function:


 * tilt of the spine (depending on the extent of muscle contraction),
 * fixation of the 12th rib.