Name Extensor digitorum longusPronunciation (eks-TEN-sor dij-I-TOR-um LONG-gus) Origin/Proximal Attachment Upper ¾’s of anterior-medial surface of fibula Adjacent anterior surface of interosseous membrane middle & distal phalanxes of crural fascia Lateral condyle of tibia Anterior crural intermuscular septum Septum between it & tibialis anterior Insertion/Distal Attachment Dorsal surface of bases of foot (At the MTP joints the tendons to the 2nd, 3rd & 4th toes are each joined on the lateral side by a tendon of the extensor digitorum brevis) Action/Relevance Extends the lateral 4 toes Weakly dorsiflexes & everts 2nd-5th toes (via 4 tendons & a fibrous expansion) synergistically with tibialis anterior & extensor Hallucis longus Innervation Deep peroneal nerve (L4, 5,S1) Notes Pennate muscle In upper part of low leg the anterior tibial vessels & deep peroneal nerve lie between the muscle & tibialis anterior At a lower level extensor Hallucis longus also comes between them It becomes tendinous at about the same level as tibialis anterior The tendon passes behind the superior extensor retinaculum & within a loop of the inferior retinaculum with peroneus tertius Tendon divides into 4 slips | 
