The subclavius muscle is a little known muscle that lies deep in the upper anterior chest wall. Its main action is to anchor the clavicle. Its proximal attachment (origin) is the 1st rib and costal cartilage. The distal attachment (insertion) is the inferior surface of the mid-clavicle. Innervation is via a local nerve branch off the brachial plexus.
The muscle is of clinical significance in that it is intentionally punctured when placing a subclavian central venous catheter. It also functions in protecting the underlying subclavian artery and vein from being punctured in displaced clavicle fractures.
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