Muscles of the front of the leg. (peroneus tertius visible at center left)
|Origin||distal anterior surface of the fibula also the interosseous membrane|
|Insertion||dorsal surface of metatarsal 5|
|Artery||anterior tibial artery|
|Nerve||deep fibular nerve|
|Actions||dorsiflexion and eversion of the foot|
|Latin||Musculus peronaeus tertius, musculus fibularis tertius|
|Anatomical terms of muscle|
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The muscle arises from the lower third of the anterior surface of the fibula (anterior compartment of lower leg); from the lower part of the interosseous membrane; and from an intermuscular septum between it and the peroneus brevis muscle. The septum is sometimes called the intermuscular septum of Otto.
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 fifth digit.
It is innervated by the deep fibular nerve, unlike the other peroneal muscles which are innervated by the superficial fibular nerve, since the peroneus tertius is a member of the anterior compartment.
The muscle may be absent in humans; it is seldom found in other primates, a fact that has linked its function to efficient terrestrial bipedalism.
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