Nervous System.

The Nervous System is the body's information gatherer, storage center and control system. Its overall function is to collect information about the external conditions in relation to the body's internal state, to analyze this information, and to initiate appropriate responses to satisfy certain needs. Neurons. The cells that make up the nervous system are called neurons. Long, stringy neurons are perfect for carrying the electrical messages that are the "language" of the nervous system. Brain. …

…only specific functions are affected. People who have damages on the right side can loose the ability to understand jokes, appreciate music and sing. On the other side, people with damage on the left side frequently cannot speak (but they can sing), cannot do math exercises and they loose the ability to recognize familiar faces. In some cases, the damage allows this people to recognize them by the voice but not by the exterior appearance.