Fibularis (Peroneus) Longus

Written by Roxanne Salkeld

Last updated January 16, 2023 • 6 Revisions

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.

  • Attachments
    • 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.

Fig 1
Fibularis longus muscle of the lateral leg

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