Fibularis muscles

The fibularis muscles (also called peroneal muscles or peroneals or peroneus muscles or peronæus) are a group of muscles in the leg. While the muscle group exist in many variation is normally composed of three muscles; fibularis longus, brevis and tertius. The fibularis muscles all originate from the fibula and inserts onto the metatarsals.

The fibularis longus and brevis are much more similar to each other than they are to the fibularis tertius. The fibularis longus and brevis are both located in the lateral compartment of the leg, supplied by the fibular artery and innervated by the superficial fibular nerve, while the fibularis tertius in located in the anterior compartment, supplied by the anterior tibial artery and innervated by the deep fibular nerve. Another difference between the fibularis longus and brevis and fibularis tertius is that while all the muscles everts the foot; the fibularis longus and brevis plantarflex the foot while the fibularis tertius dorsiflexes it.

The peroneus muscles are highly variable and several variants have been noted as being occasionally present, such as peroneus digiti minimi and peroneus quartus.^[1] The quartus is more closely associated with the tendons of the extensor digitorum longus, and may send a small tendon to the fifth digit.^[2]

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