Nerves are complex structures that carry electrical information throughout our bodies. Virtually every tissue is connected to the central nervous system through nerves. The nerves are composed of tens of thousands of nerve cells called neurons. The nerve cells have varied functions including muscle contraction and relaxation (Motor Neurons), temperature sense, position sense, vibratory sense, touch sense, pain sense. Additionally there are nerves that conduct specialized sensations such as hearing, seeing, smelling and tasting. Nerves are also involved in many activities that regulate the body's functions automatically. Pain nerves often begin as special receptor endings implanted in various tissues. The receptors' axons join together to form nerve fibers which in turn form smaller nerves that join with larger nerves. These continue to come together with other nerves as they approach the spinal cord. Just before they attach at different levels of the spinal cord the axons run into nerve cell bodies in an area known as the Dorsal Root Ganglion (DRG).These cell bodies send terminal axons to synapse with the cell bodies in the back part of the spinal cord and it is this way that pain is passed to the brain.