Contents
Anatomy
General information
- This section is strictly limited to anatomy, you might be looking for clinical relevant information which is found under the clinical chapters -- muscles section, click here to go to that page
- The muscle unites with the iliacus to become the iliopsoas
Position
- Deep
Origin
- Along the lateral side of the lumbar vertebral bodies of Th12-L5 as well as the accompanying intervertebral discs
- Procesus transversus L1-L5
- Anterior aspect
Insertion
- Trochanter minor femur
Main function
- Hip
- Flexion
- Lateral rotation
- Trunk
- Flexion
- Lateral flexion
- Pelvis
- Anterior tilt
Secondary function
- Trunk
- Contralateral rotation
- Pelvis
- Contralateral rotation
Nerve innervation
- Segmental
- L1-L4
- Peripheral
- Plexus lumbalis
Arterial supply
- Lumbar artery
- Iliolumbar artery
Palpation muscle belly
- Patient position
- Supine
- Place the patient's hips in flexion by placing a pillow under the knees
- Place your hand on the patient's stomach between crista iliaca and the 12th rib about halway between SIAS and umbilicus
- Palpate deep with even pressure towards psoas major in a posteromedial direction
Strength test
- Patient position
- Supine
- Stabilize the opposite crista iliaca with your hand
- Ask the patient to hold the knee extended throughout the testing
- Position the patient's hip in flexion and somewhat abduction and lateral rotation
- Give resistance towards the anteromedial aspect of the lower tibia in an extension and somewhat abduction direction so that the patient is giving force towards flexion and adduction