Extensor digitorum longus of the foot arises from the:
- lateral condyle of the tibia
- superior two-thirds of anterior shaft of fibula
- anterior surface of interosseous membrane
- superior tibiofibular joint
Becoming tendinous beyond the distal half of the tibia, it passes under the superior and inferior extensor retinaculae to the dorsal surface of the foot. Within the foot, it divides into four slips which insert into the dorsal extensor expansions of the lateral four toes.
It receives its blood supply from the:
- anterior tibial artery
- anterior lateral malleolar artery
It is innervated by the deep peroneal nerve (L5, S1).
The actions of extensor digitorum longus of the foot are to:
- extend the toes
- dorsiflex the foot
- tauten the plantar aponeurosis