What muscles are innervated by the deep branch of the common fibular nerve?

The deep branch of the common fibular nerve primarily innervates muscles located in the anterior compartment of the leg, which are crucial for dorsiflexion and extension of the toes. The correct answer includes the extensor digitorum longus, fibularis tertius, and extensor hallucis longus.

The extensor digitorum longus is responsible for extending the second to fifth toes and assisting with dorsiflexion. The fibularis tertius, while it is often considered an accessory muscle, assists in dorsiflexion and eversion of the foot. The extensor hallucis longus extends the big toe and contributes to ankle dorsiflexion as well.

These muscles work together to facilitate movements critical for walking and running, particularly in actions such as raising the foot to clear the ground. The involvement of these specific muscles underscores the role of the deep branch of the common fibular nerve in the motor function of the anterior compartment of the leg.