There are three known poles of the cerebral hemispheres: the occipital pole, the frontal pole, and the temporal pole. These commissures transfer information between the two hemispheres to coordinate localized functions. Smaller commissures, including the anterior commissure, the posterior commissure and the fornix, also join the hemispheres and these are also present in other vertebrates. In eutherian (placental) mammals, the hemispheres are linked by the corpus callosum, a very large bundle of nerve fibers. Each of these hemispheres has an outer layer of grey matter, the cerebral cortex, that is supported by an inner layer of white matter. The brain can thus be described as being divided into left and right cerebral hemispheres. The vertebrate cerebrum ( brain) is formed by two cerebral hemispheres that are separated by a groove, the longitudinal fissure.
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