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| Origin:
Posterior surface of body of ulna distal to origin of supinator,
interosseus membrane, and posterior surface of middle one third of body of
radius
Insertion: Base of first metacarpal bone, radial side Innervation: Radial, C6, 7, 8 Action: Abducts and extends the CMC of the thumb, abducts (radially deviates) and assists in flexing the wrist |
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