Major Muscles of the Posterior Compartment of the Leg

Flexor Digitorum Longus: Attachments, Nerve Supply, and Actions

The Flexor Digitorum Longus (FDL) is a crucial muscle located in the posterior compartment of the leg. It plays a vital role in toe flexion and foot support.

Anatomical Attachments

The FDL originates from the posterior surface of the tibia and extends downward into the foot. Its tendons attach to the distal phalanges of the four lateral toes.

Nerve Supply

The Flexor Digitorum Longus is innervated by the tibial nerve, originating from the L4-S3 spinal nerve roots.

Functions

• Flexes the lateral four toes
• Assists in maintaining foot arch stability
• Supports propulsion during walking and running

Clinical Significance

Damage to the tibial nerve can lead to impaired toe flexion, resulting in difficulties with balance and walking.