Superior view of deep white matter tracts within the cerebrum.  The corpus callosum is a large bundle of commissural fibers that connects the two cerebral hemispheres.  The tapetum of the corpus callosum contains fibers from the splenium that arch over the atrium of the lateral ventricles and continue into the lateral walls of the posterior and temporal horns of the lateral ventricles.  The cingulum is a C-shaped bundle of association fibers located within the cingulate gyrus just superior to the corpus callosum.  The cingulum connects components of the limbic system in the frontal lobe to the hippocampus and entorhinal cortex within the temporal lobe.  The caudate nucleus is visible within the inner curvature of the lateral ventricle.   The optic radiations course posteriorly within the occipital lobes toward the primary visual cortex. (Image courtesy of AL Rhoton, Jr.)