[TA] a nervelike, white band composed primarily of nerve fibers originating from the mitral cells and tufted cells of the olfactory bulb but also containing the scattered cells of the anterior olfactory nucleus. The tract, closely applied to the inferior surface of the frontal lobe, attaches itself to the base of the cerebral hemisphere at the olfactory trigone, beyond which it extends in the form of the olfactory striae that distribute their fibers to the olfactory tubercle and, in largest number, to the olfactory cortex on and around the uncus of the parahippocampal gyrus.olfactory nerves [CN I], under nerve. SYN: tractus olfactorius [TA], olfactory peduncle.