MSK - Superficial Fibular Nerve Flashcards Preview

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Flashcards in MSK - Superficial Fibular Nerve Deck (21):
1

What are the nerve roots of the superficial fibular nerve?

L4-S1

2

What are the motor functions of the superficial fibular nerve?

Innervates the muscles in the lateral compartment of the leg

3

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

4

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

Common fibular nerve

5

Where does the Superficial Fibular Nerve arise?

Neck of the Fibula

6

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

7

During its descent, it gives off motor branches

What muscles are supplies by these branches?

Fibularis Longus and Brevis

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?

 Anterolateralaspect of the lower leg

9

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

10

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

Enter the foot to innervate the majority of its dorsal surface

11

What muscles does the superficila fibular nerve innervate?

What compartment do they form?

Fibularis Longus 

Fibularis Brevis

Lateral compartment of the lower leg

12

What cutaneous innervation does the superficial fibular nerve directly supply?

Skin over the anterolateral leg

13

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

Skin of the dorsum of the foot

14

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

L5 and S1

15

Label the cutaneous innervation of the lower leg

16

What is Superficial Fibular Nerve Entrapment?

Nerve Compression

17

How does Superficial Fibular Nerve Entrapment clinically present?

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

18

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

19

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

20

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

21

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