The common fibular nerve is a peripheral nerve of the lower limb. In this article, we shall look at the anatomy of the common fibular nerve – its anatomical course, functions and clinical correlations. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Overview Nerve roots: L4 – S2 Motor: Innervates the short head of the biceps femoris directly. Also supplies (via branches) the muscles in the lateral and anterior compartments of the leg. Sensory: Innervates the skin of the lateral leg and the dorsum of the foot. Pro Feature - Dissection Images Borders and contents of the popliteal fossa Borders and contents of the popliteal fossa You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Anatomical Course The common fibular nerve arises at the apex of the popliteal fossa, where the sciatic nerve bifurcates into the tibial and common fibular nerves. It follows the medial border of the biceps femoris, running in an inferolateral direction, over the lateral head of the gastrocnemius. At this point, the common fibular nerve gives rise to two cutaneous branches, which contribute to the innervation of the skin of the leg. To enter the lateral compartment of the leg, the nerve wraps around the neck of the fibula, passing between the attachments of the fibularis longus muscle. Here, the common fibular nerve terminates by dividing into the superficial fibular and deep fibular nerves. By TeachMeSeries Ltd (2025) Fig 1Posterior view of the leg, with the superficial muscles removed. Anatomical course of the common fibular nerve shown. By TeachMeSeries Ltd (2025) Fig 2Anterior view of the leg. Common fibular nerve and its terminal branches Motor Functions The common fibular nerve innervates the short head of the biceps femoris muscle (part of the hamstring muscles, which flex at the knee) In addition, its terminal branches also provide innervation to muscles: Superficial fibular nerve: Innervates the muscles of the lateral compartment of the leg; fibularis longus and brevis. These muscles act to evert the foot. Deep fibular nerve: Innervates the muscles of the anterior compartment of the leg; tibialis anterior, extensor digitorum longus and extensor hallucis longus. These muscles act to dorsiflex the foot and extend the digits. It also innervates some intrinsic muscles of the foot. If the common fibular nerve is damaged, the patient may lose the ability to dorsiflex and evert the foot and extend the digits. Sensory Functions There are two cutaneous branches that arise directly from the common fibular nerve as it moves over the lateral head of the gastrocnemius: Sural communicating nerve – combines with a branch of the tibial nerve to form the sural nerve, which innervates the skin over the lower posterolateral leg. Lateral sural cutaneous nerve – innervates the skin over the upper lateral leg. In addition to these nerves, the terminal branches of the common fibular nerve also have a cutaneous function: Superficial fibular nerve – innervates the skin of the anterolateral leg and dorsum of the foot (except the first webbed space). Deep fibular nerve – innervates the skin of the first webbed space. By TeachMeSeries Ltd (2025) Fig 3Cutaneous innervation of the leg, ankle and dorsum of foot Clinical Relevance Damage to the Common Fibular Nerve The common fibular nerve is most commonly damaged by a fracture of the fibula, or the use of a tight plaster cast. The anatomical course of the common fibular nerve causes it to wrap round the neck of the fibular, and so any fractures of the fibular neck can cause nerve palsy. Patients with common fibular nerve damage will lose the ability to dorsiflex the foot at the ankle joint. Hence the foot will appear permanently plantarflexed – known as footdrop. They may also present with a characteristic gait, as a result of the footdrop (for more information, see Walking and Gaits). There will also be a loss of sensation over the dorsum of the foot, and lateral side of the leg. Innervation is preserved on the medial side of the leg (supplied by the saphenous nerve, a branch of the femoral), and the heel and sole (supplied by the tibial nerve, a branch of the sciatic). By Mohamed Ali Khalifa, TeachMeSeries Fig 4Left footdrop. This can occur following common fibular or deep fibular nerve palsy. Do you think you’re ready? Take the quiz below Pro Feature - Quiz The Common Fibular Nerve Question 1 of 3 Submitting... Skip Next Rate question: You scored 0% Skipped: 0/3 1800 More Questions Available Upgrade to TeachMeAnatomy Pro Challenge yourself with over 1800 multiple-choice questions to reinforce learning Learn More Print Article Rate This Article