AnatomyDeck

Muscle

Flexor digitorum longus

Flexes the lateral four toes

Lower limbMuscular system

High-yield

Flexes toes 2–5; tibial nerve. Its tendon runs behind the medial malleolus (Tom, Dick, and Harry).

Overview

A deep posterior leg muscle flexing the lateral four toes and plantarflexing the ankle; its tendon crosses that of tibialis posterior.

Reference facts

  • Origin

    Posterior surface of the tibia (below the soleal line)

  • Insertion

    Bases of the distal phalanges of the lateral four toes

  • Action

    Flexes the lateral four toes and plantarflexes the ankle; supports the arches

  • Innervation

    Tibial nerve (L5, S1, S2)

  • Blood supply

    Posterior tibial artery

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