Extensor Digitorum LongusThe structure indicated is the extensor digitorum longus muscle. The extensor digitorum longus is one of the four muscles of the anterior compartment of the leg. The muscles of the leg consist of three compartments:
- Tibialis anterior
- Extensor hallucis longus
- Extensor digitorum longus
- Fibularis tertius
Origin: Proximal ½ of medial surface of fibula. Lateral tibial condyle.
Insertion: Via 4 tendons into the bases of distal and middle phalanges of lateral four toes.
Action: Extension of lateral four toes. Dorsiflexion of foot.
Innervation: Deep fibular nerveLearn more about the anatomy of the leg muscles in this tutorial.