Quadratus Lumborum

Other Names

• Deep Low Back Lateral Flexor

Heads

• Quadratus Lumborum

Movement

Spine(Lumbar)

• Lateral Flexion
  • Right Lateral flexion [Right Quadratus Lumborum]
  • Left Lateral flexion [Left Quadratus Lumborum]
• Rotation (from rotation to neutral position)
• Stabilizes pelvis and lumbar spine

Attachments

Origin

• Ilium
  • Illiac Crest
    • Posterior Inner Lip

Insertion

• Upper 4 Lumbar Vertebrae
  • Transverse Processes
• 12th Rib
  • Lower border

Related Muscles

• Obliques
• Psoas
• Erector Spinae

Comments

Activated with other muscles when pelvis elevates when standing on one leg and position of body relative to gravity is altered (as when standing on wobble board). Initially assists in rotation to neutral position only when waist is initially significantly rotated.