Origin

Fibula, posterior aspect of upper 1/3

Insertion

Base of distal phalanx of hallux

Action(s)

Flexes all joints of the big toe, plantar flexion of the ankle joint

Nerve Supply

Tibial nerve, S1 & S2 nerve roots

Arterial Supply

Peroneal artery (peroneal branch of the posterior tibial artery)

Physical Exam

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Clinical Importance

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Disease States

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Discussion

Usually a slip runs to the Flexor digitorum and frequently an additional slip runs from the Flexor digitorum to the Flexor hallucis. Peroneocalcaneus internus, rare, origin below or outside the Flexor hallucis from the back of the fibula, passes over the sustentaculum tali with the Flexor hallucis and is inserted into the calcaneum.

Figures

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From Wikipedia:
Flexor hallucis longus

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