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Peroneus Longus Origin, Insertion, Action

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Origin: The lateral head and the upper 2/3 of the lateral surface of the fibula and the anterior and posterior intermuscular septa of the leg.

Insertion: The base of the 1st metatarsal bone and the medial cuneiform

Actions: Eversion of the foot

Innervation: Superficial Peroneal Nerve (L5, S1)

Blood Supply: Branches of the posterior tibial artery

Image of the peroneus longus muscle origin and insertion

Looking for pain and symptom information? Visit the Peroneus Muscle Pain Page.

Primary Actions of the Peroneus Longus Muscle

1. Eversion of the foot at the ankle

Agonists: Peroneus Brevis

Antagonists:

  • Tibialis Anterior
  • Tibialis Posterior

2. Assists with plantarflexion of the foot at the ankle

Agonists: 

  • Gastrocnemius
  • Soleus

Antagonists:

    • Tibialis Anterior

Plantaris, tibialis posterior, flexor hallucis longus, and flexor digitorum longus also assist with plantarflexion of the foot at the ankle.

Secondary Actions of the Peroneus Longus Muscle

1. Supports the lateral longitudinal and transverse arches of the foot

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