Levatores Costarum

The levatores costarum are a set of deep muscles of the back. They consist of 12 small paired muscles, and can also be considered a deep chest wall muscle group.

• Attachments: Originates from the transverse processes of C7-T11, and attaches to the rib below.
• Actions: Elevates the ribs during respiration. Contributes to lateral flexion of the vertebral column.
• Innervation: Posterior rami of the spinal nerves T1 – T12
• Blood Supply: Posterior intercostal arteries.

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Fig 1
The levator costarum muscle group.