Summary Tibialis anterior 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 Insertion Medial and plantar surfaces of 1st cuneiform and base of first metatarsal Action 1. Dorsiflexes ankle and inverts the hindfoot 2. 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