Origin: Lateral epicondyle of the Distal humerus, the common forearm extensor origin, and the forearm extensor intermuscular septa
Insertion: Extensor mechanism and the dorsal base of the small finger Proximal Phalanx
Function: Extends the small MCP and PIP joints, and extends the CMC joint when these joints are flexed.
Nerve: Posterior Interosseous Nerve
Artery: Posterior Interosseous artery
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