origin - scapula and humerusinsertion - olecranon process of ulnainnervation - radial nerveblood supply - brachial arteryaction - extend forearm at elbow, extend and adduct arm at shoulder

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1.
origin - scapula and humerus

insertion - olecranon process of ulna

innervation - radial nerve

blood supply - brachial artery

action - extend forearm at elbow, extend and adduct arm at shoulder