<Tr> <Th> FMA </Th> <Td> 86464 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of neuroanatomy (edit on Wikidata) </Td> </Tr> <P> The corpus callosum (/ ˈkɔːrpəs kəˈloʊsəm /; Latin for "tough body"), also callosal commissure, is a wide commissure, a flat bundle of commissural fibers, about 10 cm long beneath the cerebral cortex in the brains of placental mammals . It spans part of the longitudinal fissure, connects the left and right cerebral hemispheres, and enables communication between the hemispheres . It is the largest white matter structure in the human brain, consisting of 200--250 million axonal projections . </P> <P> The posterior end of the corpus callosum, near to the cerebellum, is called the splenium . This is the thickest part, and overlaps the tela chorioidea of the third ventricle and the mid-brain, and ends in a thick, convex, free border . Splenium translates as bandage in Greek . A sagittal section of the brain shows that the posterior end of the corpus callosum is acutely bent forward, the upper and lower parts being applied to each other . </P>

What connects the two halves of the cerebral cortex