Summary Peroneus longus Origin Head of the fibula, upper 1/2 - 2/3 of lateral fibular shaft surface; also anterior and posterior intermuscular septa of leg Insertion Plantar aspect of medial cuneiform and lateral side of 1st metatarsal base Action Everts foot and plantar flexes ankle; also helps to support the transverse arch of the foot Innervation Superficial peroneal nerve (L5, S1, S2) Arterial Supply Anterior tibial and peroneal arteries