Extensor Digitorum Longus

Description

Running along the anterolateral leg, the extensor digitorum longus (EDL) arises from the lateral condyle of the tibia, the anterior surface of the fibula, and the interosseous membrane, then descends superficial to the fibula as it approaches the ankle. Medially it borders the tibialis anterior, while extensor hallucis longus comes into view deeper and slightly medial in the distal third of the leg. At the ankle the EDL tendons pass anterior to the talocrural joint beneath the superior and inferior extensor retinacula, then split distally into slips directed to toes 2 through 5; a lateral continuation blends with fibularis (peroneus) tertius toward the dorsal base of the fifth metatarsal. Bone landmarks in the field include the tibial crest medially, the fibular shaft laterally, and the dorsal midfoot and phalanges distally. That tendon course matters in the anterior compartment, where swelling after tibial fractures, reperfusion injury, or exertional compartment syndrome compromises the deep fibular (peroneal) nerve and anterior tibial vessels, producing pain with resisted toe extension and, in advanced cases, foot drop. Lacerations on the dorsum of the foot commonly involve EDL tendons near the metatarsophalangeal joints, and understanding their divergence to the lesser toes helps when repairing tendon ends and restoring digital extension. Palpation and injection planning around the anterior ankle also benefits from recognizing the retinacular tunnel that keeps these tendons apposed to the tibia and talus during dorsiflexion. Clear landmarks. Use this illustration in lower limb gross anatomy teaching, orthopaedic and podiatric surgery atlases (anterior ankle approaches, tendon repair, tendon transfer planning), and sports medicine or physiotherapy materials addressing gait deviations from deep fibular neuropathy or anterior compartment overload. Anatomical accuracy verified by SciePro's Medical Advisory Board.