EXTENSOR DIGITORUM
| ORIGIN Common extensor origin on anterior aspect of lateral epicondyle of humerus |
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| INSERTION External expansion to middle and distal phalanges by four tendons. Tendons 3 and 4 usually fuse and little finger just receives a slip |
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| ACTION Extends all joints of fingers |
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| NERVE Posterior interosseous nerve (C7, 8) |