The fibularis longus is a muscle in the lateral compartment of the leg.. It is the larger muscle in this compartment and is located superficial to the fibularis brevis.
- The fibularis longus originates from the superior and lateral surface of the fibula and the lateral tibial condyle.
- The fibres converge into a tendon, which descends into the foot, posterior to the lateral malleolus.
- The tendon crosses under the foot, and attaches to the bones on the medial side, namely the medial cuneiform and base of the 1st metatarsal.
- Actions: Eversion and plantarflexion of the foot. Also supports the lateral and transverse arches of the foot.
- Innervation: Superficial fibular (peroneal) nerve.
- Blood Supply: Fibular artery.