Structures

  • Psoas major (iliopsoas)
  • Psoas minor
  • Quadratus lumborum
  • Iliacus (iliopsoas)
MuscleActionOriginInsertionInnervationBlood supply
Psoas major- Flexion of thigh at hip joint- Bodies of T12-L5 vertebrae
- Transverse processes of L1-5
- Intervertebral discs between T12-L5
- Lesser trochanter of the femur- Anterior rami of L1 to L3- Lumbar branch of iliolumbar artery
Psoas minor- Weak flexion of lumbar vertebral column- Bodies of T12-L5 vertebrae
- Intervertebral discs between T12-L5
- Pectineal line of the pelvic brim - Anterior rami of L1- Lumbar branch of iliolumbar artery
Quadratus lumborum- Depress and stabilize 12th rib
- Weak lateral flexion of trunk
- Transverse process of L5
- Iliolumbar ligament
- Iliac crest
- Transverse processes of L1-4
- Inferior border of 12th rib
- Anterior rami of T12-L4- Lumbar branch of iliolumbar artery
Iliacus- Flexion of thigh at hip joint- Superior 2/3 of iliac fossa
- Anterior sacro-iliac
- Iliolumbar ligaments
- Lesser trochanter of femur- Femoral nerve: L2 -L4- Lumbar branch of iliolumbar artery