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The nervous system is a communications network throughout the body. It has three basic elements, the first one being sensation, sensation to gather information. Then we have analysis and this is the input of information. And then, finally, we have the response. And this is the response to the information, and then we carry out the appropriate action. There are two parts to the nervous system within the body. The first part is the central nervous system. This contains the brains and the spinal cord. The other nervous system is called the peripheral nervous system. These are the branches of nerves that fall outside of the spinal cord. Now, nerves can be damaged in many ways. One of them would be, for example, by compression.
In an example on here, if we turned around... If we turned the skeleton around, and we can see that we have these inter-vertebral discs here if these discs were to press out of in between the two vertical bodies, what would happen? It would press on one of these spinal nerves and that could because, over time, injury to the nerve. People get the sensation called sciatica, which many of you are probably familiar with, and the pain from that can be felt all the way down the back of the leg into the common perineal nerve, and into the foot, so it can because of quite extensive damage. Another way a nerve can be damaged is, for example, if someone has a very bad ankle break, and they lose feeling in their toes, or in their feet. And it's often because, again, the nerve has either been damaged or compressed. And it's imperative in that situation that that ankle is reduced as soon as possible.