The levatores costarum longi are present at T7-T11 only, spanning two rib levels. They supplement the breves and contribute to lower thoracic rib cage expansion for diaphragmatic breathing.
| Origin | Transverse processes of T7-T11 |
|---|---|
| Insertion | Outer surface of the rib two levels below |
| Nerve Supply | Dorsal rami of thoracic spinal nerves |
| Blood Supply | Posterior intercostal arteries |
| Actions | Elevates the lower ribs during deep inspiration; Assists lower thoracic extension |
|---|
At risk in T10-L1 fracture approaches. Respiratory physiotherapy targeting lower thoracic expansion activates this group.
Not directly palpable individually.
Impaired expansion from levatores costarum longi dysfunction, addressed by lower thoracic breathing exercises.
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