The second dorsal interosseous abducts the second toe laterally. The dorsal interossei abduct toes 2, 3, and 4 away from the third toe (the axis of the foot).
| Origin | Adjacent sides of the second and third metatarsal shafts |
|---|---|
| Insertion | Lateral base of the second toe proximal phalanx — abducts away from the third toe axis |
| Nerve Supply | Lateral plantar nerve — deep branch (S2, S3) |
| Blood Supply | Dorsal metatarsal artery |
| Actions | Abducts the second toe laterally from the midline (third toe axis); Flexes the second MTP joint |
|---|
Second DI wasting is an early sign of lateral plantar nerve deep branch palsy. In Morton's neuroma surgery, the second dorsal interosseous is identified and protected as the neuroma is excised from the intermetatarsal space.
Not individually palpable. Assessed by resisted second toe abduction laterally.
Identification of the second dorsal interosseous as the reference for the intermetatarsal space during third web space Morton's neuroma excision.
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