Flexor hallucis longus (Musculus flexor hallucis longus)
Educational content only — not medical advice.
Anatomy
A deep muscle on the posterior fibula; its tendon passes between the posterior tibial and peroneal tendons behind the malleoli, crossing the sole to the great toe distal phalanx.
Origin & insertion
Lower two-thirds of the posterior fibular surface.
Action
Powerfully flexes the great toe at push-off — the "driver muscle" of every step and jump.
Innervation
Tibial nerve (S1–S2).
Clinical notes
Ballet dancers’ classic tendinitis from its repeated passage in the groove beneath the talus; pointe-work compression entraps it in its sheath.
Related structures
Educational references
FAQ
What is the role of the Flexor hallucis longus?
A deep muscle on the posterior fibula; its tendon passes between the posterior tibial and peroneal tendons behind the malleoli, crossing the sole to the great toe distal phalanx.
Why is the Flexor hallucis longus clinically important?
Ballet dancers’ classic tendinitis from its repeated passage in the groove beneath the talus; pointe-work compression entraps it in its sheath.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details