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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.

Report

Description

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Musculoskeletal (MSK)

MSK

MRI

Foot & Ankle

Acquired/Developmental

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