MSK - Superficial Fibular Nerve

Question 1

What are the nerve roots of the superficial fibular nerve?

Answer 1

L4-S1

Question 2

What are the motor functions of the superficial fibular nerve?

Answer 2

Innervates the muscles in the lateral compartment of the leg

Question 3

What are the sensory functions of the superficial fibular nerve?

Answer 3

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

Question 4

The superficial fibula nerve is the terminal branch of what nerve?

Answer 4

Common fibular nerve

Question 5

Where does the Superficial Fibular Nerve arise?

Answer 5

Neck of the Fibula

Question 6

Between what muscles does the Superficial Fibular Nerve descend between after arising at the neck of the femur?

Answer 6

The** fibularis muscles** and the lateral side of the extensor digitorum longus

Question 7

During its descent, it gives off motor branches

What muscles are supplies by these branches?

Answer 7

Fibularis Longus and Brevis

Question 8

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?

Answer 8

Anterolateralaspect of the lower leg

Question 9

How and where does the superficial fibular nerve terminate?

Answer 9

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

Question 10

What do the medial and intermedial dorsal cutaneous nerves do after arising?

Answer 10

Enter the foot to innervate the majority of its dorsal surface

Question 11

What muscles does the superficila fibular nerve innervate?

What compartment do they form?

Answer 11

Fibularis Longus

Fibularis Brevis

Lateral compartment of the lower leg

Question 12

What cutaneous innervation does the superficial fibular nerve directly supply?

Answer 12

Skin over the anterolateral leg

Question 13

What cutaneous function does the superficial fibular nerve supply via the medial and intermedial dorsal cutaneous nerves?

Answer 13

Skin of the dorsum of the foot

Question 14

What are the dermatomes that correspond with the areas that the superficial fibular nerve both directly and indirectly innervate?

Answer 14

L5 and S1

Question 15

Label the cutaneous innervation of the lower leg

Answer 15

Question 16

What is Superficial Fibular Nerve Entrapment?

Answer 16

Nerve Compression

Question 17

How does Superficial Fibular Nerve Entrapment clinically present?

Answer 17

Pain and paresthesia over the lower leg and dorsum of the foot

Question 18

What injury does Superficial Fibular Nerve Entrapment frequently result from and why?

Answer 18

Ankle sprains or twisting of the ankle

This causes the nerve to stretch in the lower leg

Question 19

Where is another cause of Superficial Fibular Nerve Entrapment?

What treatment option is available?

Answer 19

The point where the nerve exits the deep fascia of the leg, the nerve becoming compressed by this fascia

Surgical decompression of the nerve

Question 20

What injuries could damage the superficial fibular nerve?

Answer 20

Damaged by fracture of the fibula or by a perforating wound to the lateral side of the leg

Question 21

How would superficial fibular nerve damage clinically present?

Answer 21

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