ABSTRACT
The idea that differences in the functioning of brain regions are due to large or small morphological differences is essentially a reductionist perspective, in which each portion of the brain has unique functions attributable to inherent neuronal wiring. Important for any theory of interhemispheric communications are the quantitative figures concerning both the cerebral cortex and corpus callosum. The information which is stored in patterns of activated and inactivated retinal cells was evident from macroscopic neuroanatomy to be transmitted to the brain along the optic nerve and tract to the lateral geniculate nucleus of the thalamus. In reality the neocortex is a convoluted sheet twisted around on itself, the details of this three-dimensional structure being extremely important clinically. Indeed the brainstem is a thick 'stem' located on midline of the brain beneath the white and grey matter of the cerebral hemispheres. Traversing the gap between the cerebral hemispheres, the corpus callosum is exposed and provides a window on mterhemispheric cortical communication.
