The function of the extensor digitorum longus is to extend 2 to 5 toes and to dorsiflex and invert the foot, with the function of extending the foot and toes.
Toe long extensor muscle function is one of the calf anterior group of muscles, located in the calf anterior lateral subcutaneous, tibialis anterior muscle lateral, for the half-feathered muscle, from the front of the fibula, tibialis superior and calf bone interosseous membrane, down through the extensor muscle on the deep surface of the upper and lower supportive bands to the dorsum of the foot is divided into four tendons to the second to the fifth toes, to become a dorsum of the toes tendon membrane stops at the middle and distal sections of the toe bone base of the muscle.
The main function of the extensor digitorum longus is to lift the ball of the foot and the 2nd to 5th toes and to aid in dorsiflexion of the foot, and they are both innervated by a deep peroneal nerve that branches from another nerve that travels from the back of the knee joint forward to the outside of the calf after passing over the surface of the bone that is very protruding underneath the joint.
The trigger point of the extensor digitorum longus muscle is on the anterolateral aspect of the calf. Damage to the extensor digitorum longus muscle can result in the inability to straighten two to five toes and affect dorsiflexion of the foot.