Peroneus Longus : The peroneus longus ( fibularis longus) is a superficial muscle in the lateral compartment of the leg muscles and works to evert and plantarflex the ankle joint.
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Origin: The muscle is originated to the head of the fibula, upper 1/2 – 2/3 of the lateral fibular surface; also anterior and posterior intermuscular septa of the leg.
Insertion: posteriorly around the lateral malleolus of the ankle and lateral side of the 1st metatarsal base.
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Function: Everts foot and plantar flex the ankle joint; also serves to support the transverse arch of the foot
Nerve Supply: Superficial peroneal nerve (L5, S1, S2); may further receive additional innervation from common or deep peroneal nerves.
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