The abductor digiti minimi of the foot is the most lateral plantar muscle, forming the prominent bulk on the lateral foot edge analogous to the abductor hallucis on the medial side. It abducts the fifth toe and supports the lateral arch through its calcaneal origin that mechanically mirrors the plantar fascia tension mechanism. Fifth toe abduction helps spread the foot during balance activities on uneven terrain.
| Origin | Lateral and plantar aspects of the calcaneal tuberosity and the plantar fascia |
|---|---|
| Insertion | Lateral side of the base of the fifth toe proximal phalanx |
| Nerve Supply | Lateral plantar nerve (S1, S2) |
| Blood Supply | Lateral plantar artery |
| Actions |
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|---|
The lateral foot border prominently formed by the ADM provides the lateral contact surface during normal gait and is the primary muscle reducing fifth metatarsal loading by spreading the foot laterally during mid-stance.
The ADM is an easily accessible electromyography target for confirming lateral plantar nerve function in tarsal tunnel syndrome, showing denervation changes alongside other lateral plantar nerve-innervated muscles. ADM atrophy visible as lateral foot thinning is an early sign of lateral plantar nerve compromise. The lateral calcaneal nerve branch supplying the lateral heel skin travels adjacent to the ADM.
The ADM forms the palpable muscle bulk along the lateral foot border from the calcaneus to the fifth MTP joint, becoming firm during fifth toe abduction and resisted lateral foot pressure.
ADM wasting from lateral plantar nerve compression producing lateral foot thinning and fifth toe abduction weakness, confirmed by EMG and managed with tarsal tunnel decompression.
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