The rhinencephalon.
D000663:Amphibians / Q000033:anatomy & histology; D000717:Anatomy, Comparative; D000818:Animals; D001717:Birds / Q000033:anatomy & histology; D005399:Fishes / Q000033:anatomy & histology; D006624:Hippocampus / Q000033:anatomy & histology; D006801:Humans; D008032:Limbic System / Q000033:anatomy & histology*; D008322:Mammals / Q000033:anatomy & histology; D009832:Olfactory Nerve / Q000166:cytology; D012104:Reptiles / Q000033:anatomy & histology; D009626:Terminology as Topic