The opponens digiti minimi of the foot is the plantar counterpart to the hand muscle of the same name. It flexes the fifth metatarsal at the CMC5 joint and deepens the transverse arch — a minor but real contributor to forefoot mechanics.
| Origin | Long plantar ligament and fibular (peroneus) longus tendon sheath |
|---|---|
| Insertion | Lateral shaft of the fifth metatarsal |
| Nerve Supply | Lateral plantar nerve — deep branch (S2, S3) |
| Blood Supply | Lateral plantar artery |
| Actions | Flexes and medially rotates the fifth metatarsal; Deepens the lateral plantar arch |
|---|
The opponens digiti minimi foot is identified in anatomical dissections and is addressed in tailors' bunion correction where fifth metatarsal CMC joint mechanics are altered.
Not individually palpable.
Fifth metatarsal adduction and rotation from opponens digiti minimi mechanics contributing to tailor's bunion (bunionette) deformity.
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