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Crus (leg) anterior compartment muscles


The anterior compartment of the leg consists of four muscles, all of which dorsal flex the ankle joint and are innervated by the deep fibular nerve from the posterior divisions of the sacral plexus. The anterior tibial artery is their common source of blood supply. These muscles sit in a tight fascial compartment anterior to the interosseous membrane between the tibia and fibula. As their tendons cross the ankle joint they are held firmly in place between the tibial and fibular malleoli by two strong retinacular bands, the superior and inferior extensor retinacula. In addition, two of the muscles reach the ends of the digits where they function as digital extensors.

Muscles Included

Tibialis anterior, Extensor digitorum longus, Peroneus tertius, and the Extensor hallucis longus


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