The third dorsal interosseous abducts the third toe away from the midline axis. The third and fourth web spaces are the most common sites of Morton's neuromas, making this and the fourth DI the muscles adjacent to the typical neuromas.
| Origin | Adjacent sides of the third and fourth metatarsal shafts |
|---|---|
| Insertion | Lateral base of the third toe proximal phalanx |
| Nerve Supply | Lateral plantar nerve (S2, S3) |
| Blood Supply | Dorsal metatarsal artery |
| Actions | Abducts the third toe laterally; Flexes the third MTP joint |
|---|
The third DI is the lateral border of the third intermetatarsal space — the most common site for Morton's neuroma. Its identification during neuroma surgery prevents inadvertent injury.
Not individually palpable.
Third dorsal interosseous forming the lateral reference for third intermetatarsal space neuroma excision in Morton's neuroma surgery.
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