What is the term for the largest nerve in the body, originating in the spine and extending to the foot?

• A. Sciatic nerve
• B. Spondylolisthesis
• C. Sternum
• D. Scaphoid bone

Answer: (A)

The largest nerve in the body is the sciatic nerve, a major peripheral nerve that begins from nerve roots in the lower spine (the lumbosacral plexus) and runs through the buttocks, down the back of the thigh, and into the leg to the foot. It is the longest and widest nerve, often about a centimeter in diameter, and it supplies much of the lower limb with motor and sensory fibers. Near the knee it divides into the tibial and common peroneal nerves that continue to the foot. The other terms refer to different structures or conditions: spondylolisthesis is a spinal misalignment, the sternum is the chest bone, and the scaphoid is a carpal bone in the wrist.