Third Dorsal Interosseous


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

Interossei - all

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