Contents
Anatomy
General information
- The peroneus tertius is also called the fibularis tertius
- 4-12% of the population do not have the peroneus tertius muscle
Position
- Mainly superficial
Origin
- Anterior aspect of fibula
- Distal 1/3
- Membrana interossea
- Distal 1/3
Insertion
- Base of 5 metatarsal
- Dorsal surface
Main function
- Ankle
- Dorsiflexion
- Tarsal joint
- Eversion
Nerve innervation
- Segmental
- L5, S1
- Peripheral
- Deep part of peroneal nerve
Arterial supply
- Anterior tibial artery
Palpation of the muscle belly
- Patient position
- Supine
- Place your hand just medial to the lateral malleoli
- Palpate just medially to the distal part of the shaft of the fibula just before the lateral malleolus
Palpation distal tendon
- Patient position
- Supine
- Palpate the tendon of extensor digitorum longus that is attaching to the 5th toe
- Ask the patient to give force towards eversion and dorsiflexion against your resistance so that the tendon of peroneus tertius becomes more visible