Peroneal Nerve (aka Fibular Nerve)
Anterior leg
Deep peroneal nerve
Innervates:
- Tibialis anterior (L4, L5)
- Provides foot dorsiflexion and to a lesser extent foot inversion.
- Extensor digitorum longus, extensor hallucis longus, and peroneus tertius (all supplied by L5, S1)
Lateral leg
Superficial peroneal nerve (lateral leg)
Innervates:
- Peroneus longus and peroneus brevis (both L5, S1).
Foot
Deep peroneal nerve
Innervates:
- The short extensor muscles of the foot: extensor digitorum brevis and extensor hallucis brevis (both L5, S1).
Key compression sites
- Peroneal nerve
- The fibular neck: the continuation of the head of the fibula (the top of the lateral leg bone).
- Causes foot drop.
Sensory innervation
- The common peroneal nerve derives a common sensory trunk that produces both the lateral sural cutaneous nerve and also the sural communicating branch.