The term limbic lobe refers to a topologically defined structure composed of the dorsal limb of the limbic lobe (LLBd) and ventral limb of the limbic lobe (LLBv). It is found in the human ( Crosby-1962 ) and macaque ( NeuroNames ). Viewed from the midline, the most prominent components are a series of gyri that form a C-shaped open ring around the corpus callosum and upper brainstem. The LLBu extends dorsally from the subcallosal gyrus (SCL), continues as the cingulate gyrus (CGG) around the genu of the corpus callosum (ccg) and across the body of the corpus callosum (ccb), ventrally as the isthmus of the cingulate gyrus (ICG) around the splenium of the corpus callosum to become the parahippocampal gyrus (PHG). Hidden deep to those prominent gyri and proceeding in the opposite, caudal to rostral direction are the amygdala and the hippocampus ( hippocampal complex, fasciolar gyrus, supracallosal gyrus and paraterminal gyrus ). The rat and mouse have, for the most part, histologically and functionally comparable structures, but the smooth cortex of rodents lacks the topological features that define it in the primate ( Swanson-2004 Hof-2000 ). For more on alternate anatomical definitions, see limbic lobe (Anthoney). For more on functional segmentation of the lobe, see limbic system and limbic circuit. For more on equivalent structures in the macaque, rat and mouse see limbic cortex. Updated 26 Jun 2024.