Flexor Hallucis Longus - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The flexor hallucis longus is a muscle within the deep compartment of the posterior leg. It is located laterally within this compartment (this is slightly counter-intuitive, as it is the opposite side to the great toe). Attachments: Originates from the posterior surface of the fibula and attaches to the plantar surface of the phalanx of the great toe. Actions: Flexion of the great toe. Innervation: Tibial nerve Blood supply: Posterior tibial artery By TeachMeSeries Ltd (2026) Fig 2Muscles 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 Frequent questions What is the flexor hallucis longus muscle? The flexor hallucis longus is a muscle situated in the deep compartment of the posterior leg, primarily responsible for flexing the great toe. It is uniquely positioned laterally in the compartment, contrasting with its function related to the great toe. Where does the flexor hallucis longus muscle originate and insert? This muscle originates from the posterior surface of the fibula and inserts onto the plantar surface of the phalanx of the great toe. Its specific attachments enable its role in toe movement. What is the primary action of the flexor hallucis longus? The primary action of the flexor hallucis longus is to flex the great toe. This function is crucial for activities such as walking and running, where toe movement plays a significant role. Which nerve innervates the flexor hallucis longus? The flexor hallucis longus is innervated by the tibial nerve. This nerve supplies the muscle, allowing it to perform its function effectively. What is the blood supply to the flexor hallucis longus? The blood supply to the flexor hallucis longus comes from the posterior tibial artery. This vascular supply is essential for delivering nutrients and oxygen to the muscle tissue. Rate This Article