Olfaction makes strong connections with the anterior portions of the temporal lobe and the amygdala. The olfactory cortex is structurally simpler than other portions of the cerebral cortex and is termed allocortex (see section XI). It includes the prepiriform and periamygdaloid cortex that comprises the anterior part of the parahippocampal gyrus covering the uncus. In some species, of course, olfaction is more important than in others. Olfactory filaments cross the cribiform plate and synapse with mitral cells in the olfactory bulbs. Axons from these cells make up the olfactory tract which extends to anterior temporal structures bilaterally as well as the basal forebrain.