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Origin
- transverse process of atlas
- posterior tubercles of transverse process of C2-C6
Insertion
- passes downward and laterally
- upper surface of first rib
- behind groove for subclavian artery
- behind roots of brachial plexus
- behind subclavian artery
Nerve Supply
- branches from anterior rami of cervical nerves
Action
- assists in elevating first rib
- laterally flexes and rotates cervical spine
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