The fourth dorsal interosseous is the most lateral of the dorsal interossei. It abducts the fourth toe and is adjacent to the fourth web space neuroma location.
| Origin | Adjacent sides of the fourth and fifth metatarsal shafts |
|---|---|
| Insertion | Lateral base of the fourth toe proximal phalanx |
| Nerve Supply | Lateral plantar nerve (S2, S3) |
| Blood Supply | Dorsal metatarsal artery |
| Actions | Abducts the fourth toe laterally; Flexes the fourth MTP joint |
|---|
The fourth DI borders the fourth intermetatarsal space, the second most common Morton's neuroma site. It is identified and preserved during fourth web space neuroma excision.
Not individually palpable.
Fourth dorsal interosseous as the anatomical reference for fourth intermetatarsal space during Morton's neuroma excision.
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