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The peroneus longus (Latin: musculus peroneus longus; musculus fibularis longus), also known as the fibularis longus, is a superficial muscle located in the lateral compartment of the lower leg together with the peroneus brevis muscle. The peroneus longus stretches between the fibula, medial cuneiform and the first metatarsal bone.
|Origin||Head and upper two-thirds of lateral surface of fibula, intermuscular septa|
|Insertion||Medial cuneiform bone, base of 1st metatarsal bone|
|Action||Foot plantarflexion, foot eversion, supports transverse arch of foot|
|Innervation||Superficial peroneal (fibular) nerve (L5 - S2)|
|Blood supply||Peroneal (fibular) artery, branches of anterior tibial artery|
The peroneus longus muscle originates from the head and superior two-thirds of the lateral surface of the fibula. Also, it arises from the intermuscular septa.
From its origin, the peroneus longus passes downward behind the lateral malleolus and inserts on the medial cuneiform bone and base of the first metatarsal bone.
The peroneus longus muscle receives arterial blood supply from the peroneal (fibular) artery - a branch of the posterior tibial artery. Additionally, it is supplied by the branches of the anterior tibial artery.