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Origin: Distal third or more of the anterior surface of the fibula, the adjoining anterior surface of the interosseous membrane and the anterior intermuscular septum.
Insertion: Inserts into the medial part of the dorsal surface of the base of the fifth metatarsal and usually sends an expansion along the medial border of the shaft the metatarsal
Actions: Assists with dorsiflexion of the foot at the ankle
Innervation: Deep Peroneal Nerve (L5, S1)
Blood Supply: Branches of the anterior tibial artery
Primary Actions of the Peroneus Tertius Muscle
Because of its size and location, the peroneus tertius muscle is not a primary mover.
Secondary Actions of the Peroneus Tertius Muscle
1. Assists with dorsiflexion of the foot at the ankle
Agonists:
- Tibialis Anterior
Antagonists:
- Gastrocnemius
- Soleus
Extensor digitorum longus and extensor hallucis longus also assist with dorsiflexion of the foot at the ankle.
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