The extensor digitorum longus is a muscle located in the lower leg. It is primarily responsible for extending the toes and assisting in dorsiflexion of the foot, which means lifting the foot upwards. This muscle plays a crucial role in activities such as walking, running, and balancing. Originating from the lateral condyle of the tibia and the upper part of the fibula, the extensor digitorum longus inserts into the extensor expansions of the second to fifth toes. It is innervated by the deep peroneal nerve, making it essential for proper foot movement and function.