MSK - Superficial Fibular Nerve Flashcards
What are the nerve roots of the superficial fibular nerve?
L4-S1
What are the motor functions of the superficial fibular nerve?
Innervates the muscles in the lateral compartment of the leg
What are the sensory functions of the superficial fibular nerve?
Supplies the vast majority of the skin over the dorsum of the foot, apart from the webbing between the hallux and the second digit and also supplies the anterior and lateral aspect of the inferior third of the leg
The superficial fibula nerve is the terminal branch of what nerve?
Common fibular nerve
Where does the Superficial Fibular Nerve arise?
Neck of the Fibula
Between what muscles does the Superficial Fibular Nerve descend between after arising at the neck of the femur?
The** fibularis muscles** and the lateral side of the extensor digitorum longus
During its descent, it gives off motor branches
What muscles are supplies by these branches?
Fibularis Longus and Brevis
After giving off its motor branches the superficial fibular nerve continues and provides a cutaneous function
To which area does it provide sensory innervation to?
Anterolateralaspect of the lower leg
How and where does the superficial fibular nerve terminate?
When the superficial fibular nerve reaches the lower third of the leg, it pierces the deep crural fascia and terminates by dividing into the medial and intermedial dorsal cutaneous nerves
What do the medial and intermedial dorsal cutaneous nerves do after arising?
Enter the foot to innervate the majority of its dorsal surface
What muscles does the superficila fibular nerve innervate?
What compartment do they form?
Fibularis Longus
Fibularis Brevis
Lateral compartment of the lower leg
What cutaneous innervation does the superficial fibular nerve directly supply?
Skin over the anterolateral leg
What cutaneous function does the superficial fibular nerve supply via the medial and intermedial dorsal cutaneous nerves?
Skin of the dorsum of the foot
What are the dermatomes that correspond with the areas that the superficial fibular nerve both directly and indirectly innervate?
L5 and S1
Label the cutaneous innervation of the lower leg
What is Superficial Fibular Nerve Entrapment?
Nerve Compression
How does Superficial Fibular Nerve Entrapment clinically present?
Pain and paresthesia over the lower leg and dorsum of the foot
What injury does Superficial Fibular Nerve Entrapment frequently result from and why?
Ankle sprains or twisting of the ankle
This causes the nerve to stretch in the lower leg
Where is another cause of Superficial Fibular Nerve Entrapment?
What treatment option is available?
The point where the nerve exits the deep fascia of the leg, the nerve becoming compressed by this fascia
Surgical decompression of the nerve
What injuries could damage the superficial fibular nerve?
Damaged by fracture of the fibula or by a perforating wound to the lateral side of the leg
How would superficial fibular nerve damage clinically present?
Loss of eversion
A loss of sensation over the majority of the dorsum of the foot and the anterolateral aspect of the lower leg could also result
