Origin
Thoracolumbar fascia, iliac crest, inguinal ligament
Insertion
Inferior margins 10th-12th ribs and adjacent costal cartilages, linea alba, pectineal line
Actions
- Lateral flexion of the torso
- Rotation of the torso
- Flexion of the torso
- Can help increase intraabdominal pressure
Innervation
- Anterior rami of intercostal nerves (T7-T11)
- Subcostal nerve (T12)
- Iliohypogastric nerve (L1)
- Ilioinguinal nerve (L1)
Blood Supply
- Lower posterior intercostal arteries and subcostal arteries
- Superior and inferior epigastric arteries
- Superficial and deep circumflex arteries
- Posterior lumbar arteries
Would you like to learn more about the internal oblique muscle? Then check out the internal oblique muscle article and video by clicking the link below: Internal Oblique Muscle Anatomy
