Distal anterior surface of the fibula


Dorsal surface of metatarsal 5


Dorsiflexion and eversion of the foot

Nerve Supply

Deep fibular nerve

Arterial Supply

Anterior tibial artery

Physical Exam

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Clinical Importance

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Disease States

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The peroneus tertius (also known as fibularis tertius) is a muscle of the human body located in the lower limb.

The muscle arises from the lower third of the anterior surface of the fibula; from the lower part of the interosseous membrane; and from an intermuscular septum between it and the peroneus brevis.

The tendon, after passing under the superior extensor retinaculum of foot and inferior extensor retinaculum of foot in the same canal as the extensor digitorum longus, is inserted into the dorsal surface of the base of the metatarsal bone of the 5th digit.


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From Wikipedia:
Peroneus tertius