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Flashcards in Superficial fibular nerve Deck (12):

Where does the superficial fibular nerve arise and descend?

it arises at the NECK of fibula, travelling between the fibularis muscles and lateral side of extensor digitorum longus, innervating the fibularis muscles of lateral leg
also innervating sensory of anterior & lateral 1/3 of inferior leg


What happens when the superficial fibular nerve reaches the lower 1/3 of the leg?

it pieces the deep crural fascia & terminates by dividing into the medial & intermedial dorsal cutaneous nerves
enter the foot to innervate the majority of its dorsal surface


What is the relationship between the common fibular nerve and the superficial fibular nerve?

the superficial fibular nerve is a terminal branch of the common fibular nerve


What is the motor function of the superficial fibular nerve?

innervates the fibularis longus & brevis
lateral compartment of lower leg


What are the motor functions of fibularis longus and brevis?

EVERT foot at subtalar joint (ankle joint - turn foot outwards)
weakly contribute to plantarflexion - mainly by gastrocnemius & soleus


Sensory function of superficial fibular nerve

1. skin over anterolateral leg
2. skin over dorsum of foot (except webbed area of 1st & 2nd toe) - medial & intermedial dorsal cutaneous nerves


Which dematomes correspond to the areas over which the superficial fibular nerve innervates?

L5 & S1


Which are the 2 common pathologies involving the damage to the superficial fibular nerve?

1. entrapment
2. direct damage (e.g. from comminuted fracture - breaking of bone into multiple fragments)


superficial fibular (peroneal) nerve entrapment:
what is it also known as? what can it cause? what is it normally a result of?

nerve compression
causes pain, paresthesia over lower (lateral) leg & dorsum of foot
result of ankle sprains / twisting of ankle - causing nerve to stretch in lower leg


What can be another cause of nerve entrapment? where does it occur? how is it treated?

at point where the nerve exits the deep fascia of the leg
nerve becomes compressed by fascia
surgical decompression of nerve - provides relief from symptoms and pain


clinical: direct damage to the superficial fibular nerve
what can it be caused by?
what will be the result?

superficial fibular nerve can be damaged by fracture of fibular / perforating wound to the lateral side of leg

results in loss of eversion (fibularis longus & brevis), loss of sensation over most of dorsum of foot & anteriolateral aspect of lower 1/3 leg


What are the nerve roots, sensory and motor function?

motor: muscles of lateral leg (fibularis longus & brevis)
sensory: dorsum of foot but NOT webbing between 1st & 2nd toe and anterior & lateral skin of inferior 1/3 of leg