Origin
Costal cartilages ribs 7-12, thoracolumbar fascia, liac crest & inguinal ligament
Insertion
Linea alba & pubic crest + pectineal line via conjoint tendon
Actions
- Provides structural support to adjacent abdominal structures
- Compresses abdomen and increases intrabdominal pressure
Innervation
- Intercostal nerves (T7-T11)
- Subcostal nerve (T12)
- Iliohypogastric nerve (L1)
- Ilioinguinal nerve (L1)
Blood Supply
- Lower posterior intercostal artery
- Subcostal artery
- Superficial and deep circumflex iliac arteries
- Inferior and superior epigastric arteries
Would you like to learn more about the transversus abdominis muscle? Then check out the transversus abdominis muscle article and video by clicking the link below: Transversus Abdominis Muscle Anatomy
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