Muscle Action Origin Insertion Innervation Blood 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