Iliocostalis Cervicis Origin
Angle of ribs 3-6
Iliocostalis Thoracis Origin
Angle of ribs 7-12
Iliocostalis Lumborum Origin
Medial end of iliac crest, lateral crest of sacrum, thoracolumbar fascia
Iliocostalis Cervicis Insertion
Transverse process of C4-C6
Iliocostalis Thoracis Insertion
Transverse process of C7 & angles of ribs 1-6
Iliocostalis Lumborum Insertion
Transverse processes L1-L4 & angles of ribs 4-12
Actions
- Unilateral contraction: lateral flexion of the trunk/vertebral column & weak lateral flexion at the base of the neck (below C4)
- Bilateral contraction: extends the trunk/vertebral column & weak extension of the base of the neck (below C4)
Innervation
- Lateral branches of the posterior rami of the spinal nerves
Blood Supply
- Dorsal branches of the posterior intercostal, subcostal, lumbar & lateral sacral arteries
Would you like to learn more about the iliocostalis muscle? Then check out the iliocostalis muscle article and video by clicking the link below: Iliocostalis Muscle Anatomy
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