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
Position
- Deep to the obliquus externus
- Superficial to the transversus abdominis
Origin
- Crista iliaca
- Inguinal ligamentet
- Lateral 2/3
- Thoracolumbar fascia
Insertion
- 10-12. ribs
- Linea alba
Main function
- Trunk
- Flexion
- Lateral flexion
- Ipsilateral rotation
- Pelvis
- Posterior tilt
Secondary function
- Pelvis
- Elevation
- Contralateral rotation
- Abdominal content
- Compression
Nerve innervation
- Segmental
- Th7-L1
Arterial supply
- Subcostal and posterior intercostal arteries
- Deep circumflexion iliac artery
- Inferior epigastric artery
Palpation
- Patient position
- Supine
- Place a pillow beneath the patient's knees to gain passive flexion of the hips
- Have the patient actively rotate the body to the same side (ipsilaterally) while you feel for the contraction
Strength test
- Patient position
- Supine
- Give resistance in a downward and diagonal direction at the medial aspect of the patient's arm
- The patient generates force in a rotation direction against the resistance