advent of histology--the science of slicing and staining brain slices for examination. It is credited to the Viennese psychiatrist Theodor Meynert (1833-1892), who in 1867 noticed regional variations in the histological structure of different parts of the gray matter in the cerebral hemispheres.

Paul Flechsig was the first to present the cytoarchitecture of the human brain into 40 areas. Alfred Walter Campbell