Fibularis (Peroneus) Longus

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
  • Originates from the superior and lateral aspect of the fibula.
  • 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 metatarsal I.
• 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.

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Fig 1
Fibularis longus muscle of the lateral leg