Fibularis Tertius

Written by Roxanne Salkeld

Last updated January 7, 2023 • 4 Revisions

The fibularis tertius is a muscle in the anterior compartment of the leg. It is an extension of the distal part of the extensor digitorum longus muscle and is not always present.

  • Attachments: Originates with the extensor digitorum longus from the medial surface of the fibula. Its tendon descends onto the dorsal surface of the foot and attaches to the fifth metatarsal.
  • Actions: Eversion and dorsiflexion of the foot.
  • Innervation: Deep fibular nerve.
  • Blood supply: Anterior tibial artery

Fig 1
The muscles of the anterior leg.

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