The common fibular (peroneal) nerve gives rise to both the deep fibular and superficial fibular nerves.
Injury to this nerve would result in LOSS OF BOTH ankle DORSIflexion (for Deep) and EVERSion (for Superficial).
The alteration in sensation would include both the first dorsal web space between the hallux and the second toe (for Deep) and the dorsum of the foot (for Superficial).
This person has decreased sensation in the first web space but sensation over the rest of the foot is normal, implying that the Deep fibular (peroneal) nerve is injured.
The superficial fibular (peroneal) nerve supplies the peroneus longus and brevis muscles. These muscles are the main evertors of the foot. Injury to this nerve would cause weakness in eversion as well as a decrease in sensation or paresthesias over the dorsolateral aspect of the foot.
For completeness, the tibial nerve plantarflexes the foot.
submitted by โshak360(20)
Lower extremity innervation
The common fibular (peroneal) nerve gives rise to both the deep fibular and superficial fibular nerves.
This person has decreased sensation in the first web space but sensation over the rest of the foot is normal, implying that the Deep fibular (peroneal) nerve is injured.
The superficial fibular (peroneal) nerve supplies the peroneus longus and brevis muscles. These muscles are the main evertors of the foot. Injury to this nerve would cause weakness in eversion as well as a decrease in sensation or paresthesias over the dorsolateral aspect of the foot.
For completeness, the tibial nerve plantarflexes the foot.