(see also: Plantar Muscles of the Foot, Innerv. Musc. Lower Limb)
- Origin: the lateral process of the tuberosity of calcaneus.
- Insertion: lateral side of the base of the proximal phalanx of the 5th toe.
- Action: Spreads the 5th toe away from the 4th toe.
- Nerve Supply: lateral plantar nerve, S1, S2