[TA] muscle of third layer of plantar muscles; origin, by two heads, the transverse head from the capsules of the lateral four metatarsophalangeal joints and the oblique head from the lateral cuneiform and bases of the third and fourth metatarsal bones; insertion, lateral side of base of proximal phalanx of great toe; action, adducts great toe; nerve supply, lateral plantar. SYN: musculus adductor hallucis [TA], adductor muscle of great toe.