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extensor carpi radialis origin
lateral epicondyle of humerus, lateral supracondyle ridge of humerus
palmar interossei insertion
medial tubercle of base of proximal phalanx of 2nd finger, dorsal hood, lateral tubercles of base of proximal phalanx of 4th, 5th fingers
palmar interossei motion
adducts 2nd, 4th, 5th fingers towards main ray; flex proximal phalanx and extend distal phalanges
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