The aim of this lecture is to present on the Nervous System and Sensitivity. Here briefly present on what is the nervous system made up of; brain, spinal cord and nerves (neurones). Our survival depends on us being sensitive to our surroundings. We need to be able to detect any changes and be able to respond to them. The nervous system consists of the brain, spinal cord, and a complex network of neurons. This system is responsible for sending, receiving, and interpreting information from all parts of the body.