QuestionSBA
QuestionChoice
Plantarflexion of the foot is performed by the gastrocnemius, soleus, flexor hallucis longus, flexor digitorum and tibialis posterior. The tibial nerve provides the motor component to each of these, not the fibular nerve.
10001042
b
Inability to plantarflex their foot
QuestionChoice
Active inversion and plantarflexion of the ankle are performed by the tibialis posterior which is innervated by the tibial nerve. This is opposed to the tibialis anterior which actively inverts and dorsiflexes the ankle and is innervated by the deep branch of the fibular nerve - this would be affected by severance of the common fibular nerve.
10001043
c
Inability to actively invert and plantarflex their ankle
QuestionChoice
Sensation of the skin in the popliteus is supplied by the posterior femoral nerve's cutaneous branch, which arises from the tibial portion of the sciatic nerve rather than the common fibular nerve. In a fibular nerve injury, sensation to the lower limb would be affected in the distribution of the sural (skin on the lower posterior leg and small toe), superficial fibular (skin on the lower lateral leg and the medial 4 toes) and deep fibular nerves (small triangle on the superior aspect of the skin between the hallux and second toe).
10001044
d
Inability to feel touch sensation in their popliteus
QuestionChoice
The common fibular nerve passes superficially around the neck of the fibula below the knee and is at risk of injury in this case. This results in foot drop whereby the muscles of the anterior and lateral compartments of the leg, which dorsiflex the ankle and are innervated by the deep and superficial branches of the fibular nerve respectively, are paralysed.
10001041
a
Inability to dorsiflex their foot
QuestionChoice
The extension of the knee is mediated by the 4 components of the quadriceps: vastus medialis, vastus lateralis, vastus intermedius and rectus femoris. Each of these are innervated by the femoral nerve which has no branches that reach below the knee.

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10001045
e
Inability to extend the knee
Concept
Chapter
2693
3856
Foot drop
Topic
141
Neurology
12755
During a bike accident, a student lacerates the proximal lateral aspect of their leg below the knee.

Which of the following describes their most likely peripheral nerve injury?
a