Any of the nerve fiber tracts that span the longitudinal fissure between the cerebral and/or cerebellar hemispheres of the brain. [ https://github.com/obophenotype/uberon/issues/325 MP:0002199 http://www.informatics.jax.org/accession/csmith http://openisbn.com/search.php?q=0-683-40008-8&isbn=1/ ]