The rotatores breves span a single thoracic vertebral level with the highest muscle spindle density in the back, functioning primarily as length and tension transducers.
| Origin | Transverse process of each thoracic vertebra |
|---|---|
| Insertion | Spinous process of the immediately adjacent vertebra above |
| Nerve Supply | Dorsal rami of thoracic spinal nerves |
| Blood Supply | Posterior intercostal arteries |
| Actions | Minor contralateral thoracic rotation; Primary: proprioceptive transducers at thoracic facet joints |
|---|
Joint manipulation alters spindle output from these muscles, producing the motor effects of spinal manipulation. EMG provides localised assessment of thoracic segmental integrity.
Not palpable individually.
Segmental proprioceptive impairment from rotatores breves involvement in chronic thoracic pain, addressed by segmental mobilisation.
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