The bone running through the middle of your back is
Backbone
The backbone is made up of the bones, tendons, and other tissues that reach from the base of the skull to the tailbone. The backbone encloses the spinal cord and the fluid surrounding the spinal cord. The backbone is also called the spinal column, spine, or vertebral column.Starting from the neck, the backbone ends in the pelvic region. It can be felt by putting fingers at the centre of the back.