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triceps brachii

A:extend forearm. Origin:long head: inferior edge of glenoid cavity; lateral head: lateral posterior humerus; medial head: posterior humerus. Insertion: ulnar olecranon. Nerve:radial

pronator teres

Action: pronates, weakly flexes forearm. Origin: medial epicondyle of humerus, coronoid process of ulna. Insertion: lateral radius. Location: lateral to brachioradialis. Nerve:median

pronator quadratus

Action: pronates forearm. Origin:distal ulna. Insertion:distal radius. Nerve: median


Action: supinates forearm. Origin: lateral epicondyle of humerus, ulna near radial notch. Insertion: radius. Nerve: deep radial.

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