Origin – lateral condyle and lateral shaft of tibia , interosseous membrane Insertion- the base of 1 st metatarsal,first cuneiform Nerve supply- deep peroneal nerve(l4,5,s1) Blood supply- anterior tibial artery Action- dorsiflexion of the ankle, inversion of the foot Palpation- lateral side of the tibia on the anterior surface during active ankle dorsiflexion tendon palpated on the medial side of anterior the surface of the ankle. Paralysis of this muscle causes foot drop. Frequently involved in “shin splints"