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As those latter two nerves form they emerge superficial to the
underlying muscles. The tibial nerve is larger than the common
peroneal nerve which has a more lateral course. Foot motion can
change the position of the nerves in this region. This “seesaw” sign
is very useful for determining whether the common peroneal nerve
is indeed part of the common sciatic nerve in the popliteal fossa
near the division of the nerve.
References
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