Peroneus Tertius Anatomy

Peroneus Tertius Muscle

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 (L5, S1)
Blood Supply: Branches from the anterior tibial artery

Primary Actions of the Peroneus Tertius

The Peroneus Tertius does not have any primary action.

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Secondary Actions of the Peroneus Tertius

1. Assists with dorsiflexion of the foot at the ankle
Agonists:

  • Tibialis Anterior

Antagonists:

  • Gastrocnemius
  • Soleus