Extensor Digitorum Longus: The extensor digitorum longus muscle is located on the outline of the lower leg, merely behind the tibialis anterior muscle. It reaches from close to the midline of the tibia and the shaft of the fibula. Then its tendon splits into four parts as it reaches over the front of the ankle. These parts continue over the surface of the foot and connect to the four smaller toes.
The actions of this muscle carry dorsiflexion of the foot, eversion of the foot, and extension of the toes.
Origin: Lateral condyle of the tibia.Head and anterior surface of the fibula.The interosseous membrane between the tibia and fibula.
Insertion: Separations into 4 tendon slips, the dorsal surface of the middle and end phalanges of the four outer toes.
Function: Extend toes 2 – 5 and dorsiflexes ankle
Nerve Supply: Deep peroneal nerve (L4, L5, S1)
Clinical Significance: Extensor Tendonitis