The Sagittal Stratum is a major corticosubcortical white matter bundle that conveys fibers from the parietal, occipital, cingulate, and temporal regions to subcortical destinations in the thalamus, the nuclei of the basis pontis, and other brainstem structures. It also conveys afferents principally from the thalamus to the cortex. It may therefore be viewed as equivalent to the internal capsule in that it is a major subcortical fiber system and not exclusively a fiber tract linking the lateral geniculate nucleus with the calcarine cortex.