(ab-dŭk'tŏr hal'ū-sis mŭs'ĕl) Origin, medial process of calcaneal tuberosity, flexor retinaculum, and plantar aponeurosis; insertion, medial side of proximal phalanx of great toe; action, abducts great toe; nerve supply, medial plantar. Synonym(s): musculus abductor hallucis [TA] .