Pertaining to the brain of a vertebrate animal, whether to the whole brain or to the brain proper or cerebrum.Pertaining to the anterior or preoral ganglia of the nervous system in invertebrate animals, regarded as the analogue or homologue of the vertebrate brain.These ganglia are commonly connected with the rest of the nervous system by an esophageal ring, or commissural fibers encircling the anterior part of the alimentary canal. See esophageal ring, under esophageal.n. A cerebral sound or letter. See I.