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Spinal cord is made up of nerves which supply information to think about. Thinking involves more complex mechanisms and neural connections. These are concentrated in the brain which is the main coordinating center of the body. The brain and spinal cord constitute the central nervous system. They receive information from all parts of the body and integrate it. We also think about our actions. Writing talking moving a chair clapping at the end of a programme are examples of voluntary actions which are based on deciding what to do next. So the brain also has to send message to muscles. This is the second way in which the nervous system system communicates with the muscles. The communication between the central nervous system and the other parts of the body is facilitated by the peripheral nervous system consisting of cranial nerves arising from the brain and spinal nerves arising from the spinal cord. The brain thus allows us to think and take actions based on that outputs The brain has three suchy major parts or regions namely the fore-brain mid-brain and hind-brain. The fore-brain is the main thinking part of the brain. It has regions which receives sensory impulses from various receptors. Separate areas of the fore-brain are specialized for hearing smell sight and so on. There are separate areas of association where this sensory information iis interpreted by putting it together with information is passed on to the motor areas which control the receptors as well as with information that is already stored in the brain. Based on all this a decision is made about how to respond and the information is passed on to the motor areas which control the movement of voluntary muscles for example our leg muscles. However certain sensations are distinct from seeing or hearing for example how do we we know that we have eaten enough. The sensation of feeling full is because of a center associated with hunger which is in a separate part of the fore-brain. Our hearts beat without our thinking about it. In fact we cannot controls these actions easily by thinking about them even if we wanted to. DF