The abductor hallucis (also abductor hallucis muscle, latin: musculus abductor hallucis) is a muscle of the sole of the foot located in the superficial layer of the medial muscle group or the muscles of the big toe. The abductor hallucis aids in abducting the big toe.
The abductor longus originates from the calcaneal tuberosity of the calcaneus bone.
The abductor hallucis inserts at the proximal phalanx of the first digit of the foot (hallux or big toe).
The main function of the abductor hallucis is abduction of the big toe, but it also participates in flexion of the big toe.
The abductor hallucis is innervated by the medial plantar nerve, one of the terminal branches of the tibial nerve.