Second Dorsal Interosseous
![](2dio.gif)
Tendons:
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
Interossei - all
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