The Extensor Hallucis Longus is a muscle located in the lower leg. It primarily functions to extend the big toe, known as the hallux, and assists in dorsiflexion of the foot, which means lifting the foot upwards. This muscle plays a crucial role in activities like walking, running, and balancing. Originating from the fibula and the interosseous membrane, the Extensor Hallucis Longus inserts into the base of the distal phalanx of the big toe. It is innervated by the deep fibular nerve, which is responsible for its motor function. Proper functioning of this muscle is essential for efficient movement and stability.