Home > Anatomy & Physiology > Muscles > Quadratus Lumborum

Quadratus Lumborum

Origin

• Posterior iliac crest
• Iliolumbar ligament

Insertion

• Twelfth rib
• Transerve processes of L1-L4

Actions

• Laterally flexes (side-bends) trunk

Innervation

• Ventral rami of the subcostal nerve
• Lumbar nerves

Daily uses

• Bending sideways to pick something up

Example strengthening exercises

• Side-bends

Example stretches

• Side stretch