Classifications

This chapter on “Classification” examines neurological classifications. Considered are classifications of neuropathology, and psychiatry. Discussed are multiple sclerosis, cranial nerves, DSM-5, and other topics. Although “eventually every system of classification breaks down,” we must classify. We classify to aid research, education, and clinical thinking. We classify anatomic structures, and we classify diseases. The basic problem is that many natural phenomena fail to fit into neat categories, and some diseases defy classification. Superimposed on the problem of nature’s complexity is the problem of the experts. Doctors disagree about classification, sometimes vehemently. We can best use our evolving classifications if we remember that nature is prone to ignore our divisions.