Origin Lateral condyle of tibia, proximal 1/2 - 2/3 or lateral surface of tibial shaft, interosseous membrane, and the deep surface of the fascia cruris Course Passes under superior and inferior extensor retinacula Insertion Medial and plantar surfaces of 1st cuneiform and on base of first metatarsal Action 1. Dorsiflexes ankle and inverts the hindfoot2. Dorsiflexes foot in preparation for heel strike (late swing phase)3. Eccentrically contracts after heel strike Innervation Deep peroneal nerve (L4, L5) Arterial Supply Anterior tibial artery