Anatomical heterogeneities between rostral and caudal AOB subdomains. The caudal AOB (cAOB) shows larger values than the rostral AOB (rAOB) in overall volume (A), in the volume of the superficial portion of the AOB, including vomeronasal (VN) and glomerular (Gl) layers (B), and in the number of glomeruli per section (C). (D) The size of glomeruli did not differ between subdomains. (E) The density of MT cells, however, was higher in the rAOB than cAOB. *P < 0.05, **P < 0.03.