The extensor digitorum longus is a muscle in the anterior compartment of the leg. It is located lateral to the tibialis anterior, and its four tendons can be palpated on the dorsal surface of the foot.
- Originates from the lateral condyle of the tibia and the medial surface of the fibula.
- The fibres converge into a tendon, which travels onto the dorsal surface of the foot.
- The tendon splits into four and each tendon inserts onto a toe, as shown in the image below.
- Actions: Extension of the lateral four toes and dorsiflexion of the foot
- Innervation: Deep fibular nerve
- Blood supply: Anterior tibial artery