Along each leg there are clumps of nervous system. It will live until it starves to death or dies of thirst, which can take up to a week. This sounds strange, but think about how incredible it is. Another remarkable difference between humans and cockroaches is in their senses. Let's look at sight first.
Humans only have one lens in each eye.
With this many lenses, the cockroach is not able to focus on objects very well. Instead, cockroaches can see when an object is moving. Cockroaches also have a very good sense of touch. Their feet are so sensitive that cockroaches can detect when the ground vibrates less that one millionth of a millimeter. Similarly, cockroaches have two projections coming off their rear quarters called cerci which can detect air movements behind them.