Answer the following question given this paragraph: 

Vertebrates have a centralized nervous system. As shown in Figure below , the nervous system consists of a brain in the head region. It also includes a long spinal cord that runs from the brain to the tail end of the backbone. Long nerve fibers extend from the spinal cord to muscles and organs throughout the body.


Q: In vertebrates, what structure runs from the brain to the tail end of the backbone?


A:
spinal cord