Medical Definition of Serratus magnus

Serratus magnus: One of the serratus muscles of the back and thorax. The serratus magnus originates from the lateral aspect (the side) of the first eight to nine ribs and inserts into the medial margin of the scapula (wing bone). The serratus anterior rotates scapula and pulls it forward and elevates the ribs.

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Reviewed on 10/30/2018