Iliocostalis
Musculus iliocostalis
The iliocostalis is the most lateral of the three erector spinae columns, connecting the pelvis and sacrum up to the ribs and lower cervical vertebrae. It extends the spine bilaterally and laterally flexes it to the same side when acting on one side. As the outermost erector, it is a major contributor to side-bending control and trunk rigidity during loaded carries and hinges.
- Actions
- Spinal extension (bilateral), Ipsilateral lateral flexion of the vertebral column (unilateral)
- Origin
- Sacrum, iliac crest, thoracolumbar fascia, and spinous processes of the vertebrae from T11 to L5 via the erector spinae aponeurosis
- Insertion
- Angles of the ribs and the transverse processes of the lower cervical vertebrae, ascending in successive slips
- Innervation
- Posterior (dorsal) rami of the spinal nerves
- Blood supply
- Posterior intercostal and lumbar arteries
- Heads
- Iliocostalis lumborum, Iliocostalis thoracis, Iliocostalis cervicis
Antagonists Rectus AbdominisExternal Oblique
Exercises (1)
Assists in