What muscles are innervated by the common fibular nerve?

• A. Cranial tibial, long digital extensor, fibularis longus
• B. Gastrocnemius and popliteus
• C. Rectus femoris and vastus lateralis
• D. Superficial gluteal and deep gluteal

Answer: (A)

The common fibular nerve is primarily responsible for the innervation of specific muscles in the lower leg. The correct answer identifies the cranial tibial, long digital extensor, and fibularis longus muscles, which are innervated by branches of the common fibular nerve.

The cranial tibial muscle plays a critical role in dorsiflexion of the ankle, allowing for lifting the front of the foot. The long digital extensor extends the toes and also assists with dorsiflexion. The fibularis longus helps to evert the foot and provides stability during activities such as walking and running. This functional coupling of these muscles underlines the importance of the common fibular nerve in facilitating movements of the ankle and foot.

In contrast, the muscles listed in the other options are innervated by different nerves. The gastrocnemius and popliteus, found in the calf, are innervated by the tibial nerve, which branches from the sciatic nerve. The rectus femoris and vastus lateralis are part of the quadriceps muscle group and are innervated by the femoral nerve. Lastly, the superficial and deep gluteal muscles receive their innervation from the gluteal nerves