Origin: the adjacent surfaces of the middle and ring metacarpals
Insertion: the ulnar base of the middle finger proximal phalanx and the middle finger ulnar digital extensor mechanism
Function: flexes, ulnar deviates (abducts) and supinates the middle finger MCP joint and extends the middle finger PIP and DIP joints
Nerve: Motor Branch of Ulnar Nerve
Artery: deep palmar arch