Spinal nerves are part of the peripheral nervous system. They run within the spinal column to carry nerve signals to and from all parts of the body.
The spinal nerves enable all the movements we do, from turning our heads to wiggling our toes, control the movements of our internal organs, such as the colon and the bladder, as well as allow us to feel touch and location of our limbs.
This electron microscope view shows the fine internal structure of one such nerve.