Question
A 22-year-old male martial arts competitor was examined by the clinician because of pain and serious disability suffered from a kick to the side of his knee. Physical examination revealed a dark bruise just distal to the head of the fibula. Which of the following muscles will most likely be paralyzed?
| A. |
Tibialis anterior and extensor digitorum longus
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| B. |
Tibialis posterior
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| C. |
Soleus and gastrocnemius
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| D. |
Plantaris and popliteus
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Show Answer
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Correct Answer � A
Explanation
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Answer A) Tibialis anterior and extensor digitorum longus
The common fibular (peroneal) nerve passes around the head of the fibula and gives off deep (L4-5) and superficial fibular (peroneal) nerve (L5, S1-2) branches.
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The two nerves supply the dorsiflexors and evertors of the foot, respectively. In this case, the tibialis anterior and extensor digitorum longus are the only muscles listed that are supplied by either of these nerve branches, and both are innervated by the deep fibular (peroneal) nerve.
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The fibularis (peroneus) brevis and longus are innervated by the superficial fibular (peroneal) nerve and are evertors of the foot.
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The tibial nerve supplies each of the other muscles listed.
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