The rotatores longi span two vertebral levels, providing a broader proprioceptive sampling zone than the breves and contributing slightly more to active rotation.
| Origin | Transverse process of each thoracic vertebra |
|---|---|
| Insertion | Spinous process two levels above |
| Nerve Supply | Dorsal rami of thoracic spinal nerves |
| Blood Supply | Posterior intercostal arteries |
| Actions | Contralateral thoracic rotation; Proprioceptive monitoring spanning two thoracic segments |
|---|
Their asymmetric development on concave and convex sides of a scoliotic curve may contribute to rotational deformity. Their bilateral activation during breathing links thoracic paraspinal function to respiratory mechanics.
Not palpable individually.
Asymmetric development contributing to rotational thoracic deformity, addressed during posterior correction surgery.
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