Peroneus longus

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

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.

Insertion

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.

Action

The peroneus longus provides plantarflexion of the foot at the talocrural (ankle) joint and foot eversion at the subtalar joint. Also, it supports the transverse arch of the foot.

Innervation

The peroneus longus is innervated by the superficial peroneal (fibular) nerve (L5 - S2) - a branch of the common peroneal (fibular) nerve.

Blood supply

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.