By the time you’re an adult, you usually have 24 movable vertebrae (instead of 33) and the rest of the bones are fused together. While most people have a straight spine, some people have additional ...

The spine (aka backbone) is a linked column of bones running from the head down to the lower back. Bone segments form the column. One bone segment is a vertebra, and multiple bone segments are ...

In this study, spinal cords that associated limb position with an unpleasant experience learned to reposition the limb after only 10 minutes, and retained a memory the next day. Spinal cords that ...