Spinal cord:

spinal cord.

part of the nervous system that extends from the brainstem to the lumbar vertebrae of the spine. The spinal cord, along wth the brain, makes up the central nervous system.

Learn more: Know your brain - Spinal cord

Watch this 2-Minute Neuroscience video to learn more about the exterior of the spinal cord and this video to learn more about the interior of the spinal cord.