The flexor digitorum longus is a muscle within the deep compartment of the posterior leg. It is a thin muscle, located medially within the compartment.
- Attachments: Originates from the medial surface of the tibia and attaches to the plantar surfaces of the lateral four digits.
- Actions: Flexion of the lateral four toes.
- Innervation: Tibial nerve
- Blood supply: Posterior tibial artery