Flexor Digitorum Longus

Joe Muscolino

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The extensor digitorum longus of the deep posterior compartment of the (lower) leg. The flexor hallucis longus has been ghosted in.

The Flexor Digitorum Longus is located in the Deep Posterior Compartment of the (lower) leg. The muscles in the deep posterior compartment are:



  • Posterior tibia to the plantar surfaces of the distal phalanges of toes #2-5.
    • The flexor digitorum longus attaches proximally onto the middle 1/3 of the posterior tibia.



  • Flexes toes #2-5 at the metatarsophalangeal and proximal and distal interphalangeal joints.
  • Plantarflexes the foot at the ankle joint.
  • Inverts (Supinates) the foot at the subtalar joint.



  1. The flexor digitorum longus is sometimes referred to as “Dick” of the “Tom, Dick, and Harry” group.
  2. Inversion is the principal cardinal-plane (frontal-plane) component of the oblique-plane motion pattern of supination.