The deep fibular nerve is a branch of the common fibular nerve, which originates from the sciatic nerve. It primarily innervates the muscles in the anterior compartment of the leg, responsible for dorsiflexion of the foot and extension of the toes. This nerve also provides sensory innervation to a small area between the first and second toes. Injury to the deep fibular nerve can lead to conditions such as foot drop, where the individual has difficulty lifting the front part of the foot. This can affect walking and balance, making it important for overall mobility.