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Since the days of Meynert it has been recognized that the brain, which macroscopically appears uniform, is made up of a number of "organs," each of which possesses a specific structure and function. Through the work of Meynert's successors, his teaching was broadened considerably. At present the cortex may be pictured as a map of 109 areas each possessing a specific histologic structure. In 1925 Economo and his co-worker Koskinas published a large contribution which embodied everything of importance pertaining to the structure of the cerebral cortex. As this contribution is not only extensive but also expensive, costing $150, it became imperative to take up the same subject in a concise form. Economo accomplished this in the form of ten lectures. He sketches in a remarkably clear and concise manner the wonderful progress made in the study of the refined anatomy of the cortex, supporting his view by sixty-one illustrations,
Zellaufbau der Grosshirnrinde des Menschen.. JAMA. 1927;89(17):1448. doi:10.1001/jama.1927.02690170072036