Deltoid
Insertion- proximal ulna. Action- flexes elbow. Triceps Medial Head: Origin- proximal half of dorsal humerus. Insertion- distal of elbow on the ulna. Action- extends elbow. Serratus Anterior: Origin- lateral service of ribs 1-8 (bone only) Insertion- medial borer of the scapula. Action- moves scapula forward. Sport/Activity- benchpress, push ... ................
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