<P> Another study of individuals with multiple sclerosis provides evidence that structural and microstructural abnormalities of the corpus callosum are related to cognitive dysfunction . Particularly, verbal and visual memory, information processing speed, and executive tasks were shown to be impaired when compared to healthy individuals . Physical disabilities in multiple sclerosis patients also seem to be related to abnormalities of the corpus callosum, but not to the same extent of other cognitive functions . </P> <P> Using diffusion tensor imaging, researchers have been able to produce a visualization of this network of fibers, which shows the corpus callosum has an anteroposterior topographical organization that is uniform with the cerebral cortex . </P> <P> The anterior commissure (also known as the precommissure) is a tract that connects the two temporal lobes of the cerebral hemispheres across the midline, and placed in front of the columns of the fornix . The great majority of fibers connecting the two hemispheres travel through the corpus callosum, which is over 10 times larger than the anterior commissure, and other routes of communication pass through the hippocampal commissure or, indirectly, via subcortical connections . Nevertheless, the anterior commissure is a significant pathway that can be clearly distinguished in the brains of all mammals . </P> <P> Using diffusion tensor imaging, researchers were able to approximate the location of the anterior commissure where it crosses the midline of the brain . This tract can be observed to be in the shape of a bicycle as it branches through various areas of the brain . Through diffusion tensor imaging results, the anterior commissure was categorized into two fiber systems: 1) the olfactory fibers and 2) the non-olfactory fibers . </P>

What type of fibres pass through the corpus callosum