Flexor Hallucis Longus

Musculus flexor hallucis longus

Lower Body LegsCalvesPosterior Chain

The flexor hallucis longus is a deep posterior compartment muscle that flexes the big toe and contributes to ankle plantarflexion and inversion. It is essential for the final push-off of the toe during gait, running, and jumping, and supports the medial longitudinal arch. It is commonly irritated in dancers and runners (“dancer’s tendinitis”) where the tendon passes behind the medial ankle.

Actions

Great toe flexion, Ankle plantarflexion, Foot inversion

Origin

Lower two-thirds of the posterior surface of the fibula and the adjacent interosseous membrane

Insertion

Plantar surface of the base of the distal phalanx of the great toe (hallux)

Innervation

Tibial nerve (S2, S3)

Blood supply

Fibular (peroneal) and posterior tibial arteries

Wikipedia ↗

legsdeep-compartmenttoe-flexionplantarflexionpush-off