Peroneus tertius

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Peroneus tertius
Muscles of the front of the leg. (peroneus tertius visble at center left.)
Latin musculus peroneus tertius
Gray's subject #129 482
Origin distal anterior surface of the fibula
Insertion    dorsal surface of metatarsal 5
Artery: anterior tibial artery
Nerve: deep fibular nerve
Action: dorsi flexes and everts foot

The peroneus tertius (also known as fibularis tertius) is a muscle of the human body located in the lower limb. It does not exist in all individuals.

The peroneus tertius is a part of the extensor digitorum longus, and might be described as its fifth tendon.

The fibers belonging to this tendon arise from the lower third or more 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 transverse and cruciate crural ligaments in the same canal as the extensor digitorum longus, is inserted into the dorsal surface of the base of the metatarsal bone of the little toe (5th metatarsal).

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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