The thoracic interspinales are poorly developed and often absent, reflecting the rib cage stability at this level. When present, they provide minor intervertebral stabilisation.
| 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 | Minor stabilisation of thoracic segmental motion; Thoracic proprioceptive monitoring |
|---|
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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