The second plantar interosseous adducts the fourth toe toward the axis of the foot (third toe axis). The three plantar interossei adduct toes 3, 4, and 5 toward the second toe axis (DAB vs PAD mnemonic).
| Origin | Medial aspect of the fourth metatarsal shaft |
|---|---|
| Insertion | Medial base of the fourth toe proximal phalanx |
| Nerve Supply | Lateral plantar nerve (S2, S3) |
| Blood Supply | Plantar arch |
| Actions | Adducts the fourth toe toward the third; Flexes the fourth MTP joint |
|---|
Plantar interossei atrophy in intrinsic minus foot from peripheral neuropathy contributes to MTP extension and IP flexion (clawtoe). Individual plantar interosseous testing is by resisted adduction of each individual toe.
Not individually palpable. Tested by resisted adduction of the fourth toe.
Plantar interosseous atrophy from diabetic peripheral neuropathy contributing to metatarsal head prominent gait and lesser clawtoe deformity.
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