The fibularis tertius is a muscle in the anterior compartment of the leg. It is an extension of the distal part of the extensor digitorum longus muscle and is not always present. Attachments: Originates with the extensor digitorum longus from the medial surface of the fibula. Its tendon descends onto the dorsal surface of the foot and attaches to the fifth metatarsal. Actions: Eversion and dorsiflexion of the foot. Innervation: Deep fibular nerve. Blood supply: Anterior tibial artery By TeachMeSeries Ltd (2025) Fig 1The muscles of the anterior leg. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article