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sciatic nerve
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sciatic nerve

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sciatic nerve, largest and thickest nerve of the human body that is the principal continuation of all the roots of the sacral plexus. It emerges from the spinal cord in the lumbar portion of the spine and runs down through the buttocks and the back of the thigh; above the back of the knee it divides into the tibial and the common peroneal nerve, both of which serve the lower leg and foot.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Michele Metych.