Cortical Extensions of the Limbic System
The cortex of the rat forms a smooth, relatively thin mantle over most of the structures that have been discussed thus far. Because the cortex is smooth, rather than convoluted, as in the case of animals having a more highly developed brain, the cerebral hemispheres are termed lissencephalic. The conceptual subdivision of a smooth mantle of cortex involves some technical difficulties, because there are few landmarks that can be used. Consequently, many of the subdivisions that have been made are based either on the detailed cellular structure of the layered cortex or on the juxtaposition to more clearly defined subcortical structures. The details of categorizing areas of the cortex on the basis of cellular organization go beyond the scope of this text, so the descriptions that follow will emphasize boundaries with respect to available landmarks. In most cases, though, the delineations were originally made by the careful study of cellular organization. Most notable in these types of studies are the classic descriptions of Krieg (1946) and Rose and Woolsey (1948). Additional accounts of these cortical systems and their connections may be found in articles by Clark (1932), Clark and Boggon (1933), Lorente de No (1934), Abbie (1938), Krieg (1947), Domesick (1969), and Leonard (1969).
KeywordsFrontal Cortex Corpus Callosum Entorhinal Cortex Limbic System Thalamic Nucleus
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