What is the spinal cord?

The spinal cord is a thick bundle of nerves that runs through the vertebrae (backbones) in your spine. This nerve bundle is about 18 inches long, starting at the base of your brain and ending at your buttocks. The spinal cord acts as a superhighway between your brain and the rest of your body. Want to take a step, or wriggle a finger? The message is normally sent through the spinal cord to these body parts, in the form of nerve impulses. The highway runs in both directions: stub a toe or touch something sharp, and those pain or pressure signals speed back up to your brain faster than you can say “ow.”