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