KEY POINTS

1. The neuron is the major functional unit of the nervous system.

2. The mammalian nervous system has two major subdivisions: the central nervous system and the peripheral nervous system.

3. The central nervous system can be divided into six anatomical regions.

4. The central nervous system is protected by the meninges and cerebrospinal fluid.

5. The nervous system collects and integrates sensory information, formulates a response plan, and produces a motor output.