Anatomy

Origin

Oblique head—second, third, and fourth metatarsal bones (base), and sheath of peroneus longus tendon

Transverse head—plantar metatarsophalangeal ligaments of third, fourth, and fifth toes, and transverse metatarsal ligaments

Insertion

Lateral side of base of proximal phalanx of great toe

Nerve

Lateral plantar nerve (S1, S2)

Actions

Adducts and flexes the big toe.

Stabilizes great toe (with abductor hallucis)