The thoracic multifidus provides segmental control of thoracic spinal motion, spanning 2-4 vertebral levels. It is less developed than lumbar multifidus but key to thoracic posture.
| Origin | Transverse processes of T1-T12 |
|---|---|
| Insertion | Spinous processes 2-4 levels above |
| Nerve Supply | Dorsal rami of thoracic spinal nerves |
| Blood Supply | Posterior intercostal arteries |
| Actions | Extension of the thoracic spine; Contralateral rotation; Segmental thoracic stabilisation |
|---|
Thoracic multifidus dysfunction contributes to thoracic kyphosis in osteoporosis. In scoliosis, asymmetric thoracic multifidus hypertrophy is found on the convex side.
Not directly palpable individually.
Asymmetric development used as a surgical landmark for curve apex level during deformity correction.
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