Note that many of these composite structur … Note that many of these composite structures could be created by simply defining them as the union of their constituent parts - e.g., Medial_lemniscus = UNION(Medial_lemniscus_of_midbrain, Medial_lemniscus_of_pons, Medial_lemniscus_of_medulla). I've hard-coded these examples using class equivalency to show there are more than a single means to bring classes together. The cerebellar peduncular complex was constructed using equivalency relations to demonstrate another alternative. Each of these mechanisms has its own set of pros and cons (BB)., It will be necessary to create a composite class set at a higher level than this, should we seek to assemble classes whose constituents lie both inside and outside the brain. For instance, to construct the entirety of the cuneate or gracile fasciculi, you'd need to included the components residing in the spinal cord as well. nents residing in the spinal cord as well.