The flexor digitorum longus is a muscle within the deep compartment of the posterior leg. It is a thin muscle, located medially within the compartment. Attachments: Originates from the medial surface of the tibia and attaches to the plantar surfaces of the lateral four digits. Actions: Flexion of the lateral four toes. Innervation: Tibial nerve Blood supply: Posterior tibial artery By TeachMeSeries Ltd (2025) Fig 1Muscles in the deep layer of the posterior 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