Superficial Peroneal Nerve
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Let's talk briefly about the oft forgotten
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superficial peroneal nerve,
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which gets a lot more attention in the knee.
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The superficial peroneal and deep peroneal
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nerve may divide higher up
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around the fibular neck, but the division
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is very variable from top to bottom.
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The superficial peroneal nerve courses up higher
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in the leg, within the peroneus longus muscle,
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it innervates the peroneus longus muscle and
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the peroneus brevis, and then it emerges through
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the peroneal musculature about halfway down
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the anterolateral aspect of the lower leg.
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It exits at a level of defect in the
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crural fascia, about 12 centimeters above
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the ankle joint, and the remaining portion
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from this point down is purely sensory.
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Inferiorly, it divides into two
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branches, which we actually see.
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There's one branch right here, very small.
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Here's the second branch here,
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also very small, right underneath the skin,
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and these are known as the medial and
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intermediate dorsal cutaneous branches.
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The superficial peroneal nerve reaches the
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dorsum of the foot where it supplies the toes
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with the exception of the first web space,
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which is owned by the deep peroneal nerve.
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You might say, "Well, can I
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really track these nerves?"
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It's pretty tough, to be honest with you,
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but a terrific landmark to assess these
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nerves is the extensor hallucis longus.
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So, if we look at our friends Tom, Harry, and
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Dick, and we just stay with Harry all the way
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down into the toe, we're gonna be in the vicinity
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of the superficial peroneal nerve, and there
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is Harry right there, and there is one of the
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divisions of the superficial peroneal nerve.
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The superficial peroneal nerve, a pure
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sensory nerve in the foot that takes care
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of the dorsal sensation of the foot,
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with the exception of the first web space.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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