What are the three main areas of the neurological system?

The three main areas of the neurological system are the central nervous system (CNS), peripheral nervous system (PNS), and autonomic nervous system (ANS). The CNS, comprising the brain and spinal cord, processes information and coordinates responses. The PNS connects the CNS to the rest of the body, facilitating communication between the brain and limbs. The ANS regulates involuntary bodily functions, such as heart rate and digestion, and operates subconsciously.