The four primary functions of the nervous system are the sensory, communicative, integrative and motor functions. The nervous system allows the body to respond quickly to various stimuli.
The purpose of the nervous system is to coordinate all bodily functions. It has four primary functions that all relate to the areas of the body for which the system handles information.
The sensory function allows the body to gather information from both within and outside the body. The nervous system then communicates that information to the brain and spinal cord. The integrative function is how the gathered information is processed. Lastly, the nervous system helps determine the motor function in which the effectors are able to act.