The thoracic interspinales are small paired slips between adjacent thoracic spinous processes. They are poorly developed and usually found only at the top and bottom of the thoracic spine (between T1 and T2 and between T11 and T12, sometimes T2-T3), being absent at mid-thoracic levels where the long, steep spinous processes overlap and the rib cage provides stability. Where present, they mainly provide position sense rather than force.
| Origin | Superior surface of thoracic spinous processes T1-T12, variably present |
|---|---|
| Insertion | Inferior surface of the spinous process immediately above |
| Nerve Supply | Dorsal rami of thoracic spinal nerves |
| Blood Supply | Posterior intercostal arteries |
| Actions |
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Where present, they assist extension between adjacent thoracic vertebrae and likely act mainly as position sensors.
Encountered during posterior thoracic spine approaches. Their absence at many thoracic levels explains the limited interspinous support, relying more on costovertebral joints for segmental stability.
Not palpable individually.
Paucity of thoracic interspinales requiring intact costovertebral joints for segmental stability.
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