The sciatic nerve (L4, 5, SI—3) arises from the sacral plexus, passes through the great sciatic foramen and descends in the posterior thigh to the popliteal fossa, where it divides into the tibial and common peroneal nerves. In the thigh, it supplies muscles and the hip joint. The posterior cutaneous nerve of the thigh (SI—3) may run with the sciatic nerve or separate from it proximally; this nerve supplies the skin of the posterior thigh and upper calf. The tibial and common peroneal nerves, together with the saphenous nerve, supply all structures below the knee.
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