Deep Fibular Nerve

Question 1

Roots

Answer 1

L4 and L5

Question 2

Motor functions

Answer 2

Innervates the muscles in the anterior compartment of the leg 
Tibialis anterior 
Extensor hallucis longus 
Extensor digitorum longus 
Fibularis tertius 
Also some of the intrinsic muscles of the foot 
Extensor digitorum brevis 
Extensor hallucis brevis

Question 3

Sensory functions

Answer 3

Triangular region of skin between 1st and 2nd toes

Question 4

Footdrop

Answer 4

Compression can cause the patient to lose the ability to dorsiflex and therefore unopposed plantarflexion occurs
Foot slaps the floor during walking as it cannot be lowered in a controlled manner
Patient develops an abnormal gait…
- Waddling gait - patient leans excessively to normal limb
- Swing-out gait - patient abducts the abnormal limb
- High steppage gait - patient flexes hip and knee excessively on abnormal limb
Reasons for compression…
- Leg muscles have been excessively used -> pain in anterior leg
- Tight-fitting shoes - compression beneath extensor retinaculum -> pain in dorsum of foot