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Peroneus Tertius Anatomy: Origin, Insertion, Action

Anatomy Study: Origin, Insertion, Action and Innervation of the Peroneus Tertius Muscle

Peroneus Tertius Anatomy
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
Action: Assists with dorsiflexion of the foot at the ankle
Innervation: Deep Peroneal (L5, S1)
Blood Supply: Branches from the anterior tibial artery

Synergist: Peroneus longus, Peroneus brevis, Extensor digitorum longus

Antagonist: Soleus

For pain and symptom information see: Peroneus Tertius Low Leg, Ankle, Heel Pain

Primary Actions of the Peroneus Tertius

1. The Peroneus Tertius does not have any primary action.

Secondary Actions of the Peroneus Tertius:

1. Assists with dorsiflexion of the foot at the ankle

    • Agonists: Tibialis Anterior
    • Antagonists: Gastrocnemius, Soleus


Recommended Anatomy Study Aids

Musculoskeletal Anatomy Flashcards Musculoskeletal Flashcards Are you a student or professional therapist who needs to brush up on the musculoskeletal system? Dr. Joseph E. Muscolino DC has developed a comprehensive set of flashcards that will help develop a mind’s picture of exactly where the muscles lie under the skin. A highly recommended study aid for students. Great for non students who want an easy comprehensive anatomy guide.

Trail Guide To The Body


The Trail Guide To The Body is another excellent book to help you learn the musculature of the human body. Though the book is geared toward massage therapists and physical therapist assistants, the book with its illustrations and text helps anyone gain a thorough understanding of the human musculoskeletal system and movement. I highly recommend this book for anyone studying anatomy and believe that MTs, PTAs, and teachers of body movements should have this book in their possession. I also highly recommend this book for the lay person who wants to gain understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!




The Trigger Point Therapy Workbook – Claire Davies, Amber Davies, and David G. Simons

Basic Clinical Massage Therapy: Integrating Anatomy and Treatment – James H. Clay and David M. Pounds

Trigger Point Therapy for Myofascial Pain – Donna Finando and Steven Finando

Massage Therapy Principles and Practice – Susan Salvo

Theory & Practice of Therapeutic Massage – Mark Beck


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