
Iliocostalis Lumborum O, I, A
Origin: The iliolumbar fascia, the posterior medial lip of the iliac crest, the lateral crest of the sacrum, and the spinous processes of T11 to L5
Insertion: Inferior borders of the angles of the lower six or seven ribs
Actions: Extension and lateral flexion of the thoracic spine, extension and lateral flexion of the lumbar spine
Innervation: Dorsal primary rami of T11 to L5
Blood Supply: Intercostal and lumbar arteries
Primary Actions of the Iliocostalis Lumborum
1. Extension of the thoracic spine when acting bilaterally
- Iliocostalis cervicis
- Iliocostalis thoracis
- Longissimus cervicis
- Longissimus thoracis
- Spinalis thoracis
- Semispinalis cervicis
- Semispinalis thoracis
- Rectus Abdominis
- Iliocostalis cervicis
- Iliocostalis thoracis
- Longissimus cervicis
- Longissimus thoracis
- External Oblique
- Internal Oblique
- Iliocostalis cervicis
- Iliocostalis thoracis
- Longissimus cervicis
- Longissimus thoracis
- External Oblique
- Internal Oblique
- Longissimus thoracis
- Spinalis thoracis
- Rectus Abdominis
- Longissimus thoracis
- Psoas major
- Quadratus lumborum
- External oblique
- Internal oblique
- Longissimus thoracis
- Psoas major
- Quadratus lumborum
- External oblique
- Internal oblique
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