neuropathologist

n. doctor who specializes in neuropathology, one who studies diseases of the nervous system

Neuropathology is the study of disease of nervous system tissue, usually in the form of either small surgical biopsies or whole autopsy brains. Neuropathology is a subspecialty of anatomic pathology. A different and more academic view is that neuropathology has its home in the clinical neurosciences. This is certainly supported by the history of the discipline and its recent development.
See more at Wikipedia.org...

A pathologist who specializes in diseases of the nervous system. A pathologist identifies disease by studying cells and tissues under a microscope.