What are the main actions of the peroneal muscles?

Both peroneus longus and brevis primarily perform eversion of the foot. Additionally, they help support the foot's arches: the peroneus longus supports the lateral and transverse arches, while the peroneus brevis maintains the lateral longitudinal arch.

Where do the peroneal muscles insert?

The peroneus longus inserts at the base of the 1st metatarsal and medial cuneiform via the sole of the foot. The peroneus brevis inserts at the lateral base of the 5th metatarsal.

What nerve innervates the peroneal muscles?

Both the peroneus longus and peroneus brevis are innervated by the superficial peroneal nerve.

How are the peroneal muscles tested clinically?

Clinically, they are tested by having the patient perform eversion against resistance. If normal, their tendons should be palpable below the lateral malleolus.

What foot deformities are associated with peroneal muscle issues?

Two main deformities: Talipes varus is an inward deformity caused by peroneal muscle paralysis. Talipes valgus is an outward deformity resulting from overactive peroneal muscles when anterior tibial muscles are paralyzed.

What is the origin of the peroneus longus muscle?

The peroneus longus originates from the head and upper two-thirds of the lateral fibula, along with the intermuscular septa and deep fascia.

What is the origin of the peroneus brevis muscle?

The peroneus brevis originates from the lower two-thirds of the lateral fibula and the intermuscular septa.

Lateral Leg Muscles – Fibularis Longus & Brevis

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