Advanced Deep Fibular Nerve Quiz

Q1. Why can an isolated deep fibular nerve lesion cause foot drop while preserving substantial foot eversion?

• The deep fibular nerve supplies the major evertors
• The dorsiflexors are affected while major evertors retain superficial fibular innervation
• Both dorsiflexors and evertors are supplied only by the tibial nerve
• Foot drop requires complete sciatic nerve paralysis

Q2. Which finding helps distinguish deep fibular neuropathy from a common fibular lesion near the fibular neck?

• Weak tibialis anterior
• Preserved strength of fibularis longus and fibularis brevis
• First web space numbness
• Weak great toe extension

Q3. Why can compression beneath the inferior extensor retinaculum produce anterior tarsal tunnel syndrome?

• The nerve winds around the medial malleolus
• The tibial nerve passes through this anterior tunnel
• The nerve travels through the plantar aponeurosis
• The deep fibular nerve passes through a confined space beneath the extensor retinaculum

Q4. Which symptom pattern best fits distal deep fibular nerve compression at the anterior ankle?

• First web space paresthesia with possible extensor digitorum brevis weakness
• Posterior thigh numbness with hamstring paralysis
• Medial thigh numbness with adductor weakness
• Complete loss of plantar sensation with calf paralysis

Q5. Why may ankle dorsiflexion remain normal in a very distal deep fibular nerve lesion on the dorsum of the foot?

• Dorsiflexion is supplied by the tibial nerve
• Motor branches to the major dorsiflexors have already arisen proximally
• The distal nerve contains no sensory fibers
• The common fibular nerve supplies tibialis anterior directly

Q6. Which branch is most relevant when assessing extensor digitorum brevis after distal deep fibular nerve injury?

• Sural nerve
• Medial plantar nerve
• Lateral terminal branch
• Medial terminal branch

Q7. Why is first dorsal web space sensation useful for neurological localization?

• It is supplied exclusively by the tibial nerve
• It represents the entire L4 dermatome
• It is supplied only by the sural nerve
• It is a characteristic autonomous sensory territory of the deep fibular nerve

Q8. Which pattern suggests a lesion proximal enough to affect the deep fibular nerve in the anterior leg rather than only its distal sensory branch?

• Dorsiflexion weakness with first web space sensory loss
• First web space numbness with normal anterior compartment strength
• Isolated plantar numbness
• Weak hip abduction only

Q9. Why can anterior compartment syndrome threaten deep fibular nerve function?

• The nerve lies only in subcutaneous tissue
• The nerve is protected inside the fibula
• The nerve travels exclusively in the posterior compartment
• The nerve lies within the confined anterior compartment

Q10. Which statement best integrates deep fibular nerve anatomy?

• It is an L2-L4 femoral branch supplying quadriceps and medial leg skin
• It is an L4-S1 common fibular branch supplying anterior compartment muscles and the first dorsal web space
• It is an L4-S3 tibial branch supplying the posterior leg and sole
• It is an S1-S2 superficial fibular branch supplying only the lateral compartment