How do nerves in muscles communicate with the body?

Under ideal circumstances, the nerves in muscles are constantly producing and transmitting information to the spinal cord concerning movement, tone, and positioning. This information is processed in the spinal cord and brain, and responses are immediately sent back to the muscles. All of this production, transmission, processing, and retransmission sets up a continuous cycle of free-flowing information that keeps the muscles of your neck and back working properly.

This cycle has one other very important property. When normally functioning muscles and nerves are working in concert, they produce an abundance of information that inhibits pain-producing nerves from generating their impulses. The constant beneficial messages of movement and positioning allow little or no room for distressful pain signals to pass into the spinal cord or brain. Unless pain signals are turned on in overwhelming force, the body's incomparable system of prioritizing information relegates the production of most pain to nothing more than undetectable background noise.