Origin: Adjacent surfaces of the index and middle metacarpals
Insertion: the radial base of the middle finger proximal phalanx and the middle finger radial digital extensor mechanism
Function: flexes, radially deviates (abducts), and pronates the middle finger MCP joint, and extends the middle PIP and DIP joints
Nerve: Motor Branch of Ulnar Nerve
Artery: Deep Palmar Arch