The isodendritic core of the brain stem.
D000717:Anatomy, Comparative; D000818:Animals; D005075:Biological Evolution; D001933:Brain Stem / Q000166:cytology*; D003712:Dendrites / Q000166:cytology*; D004027:Diencephalon / Q000166:cytology; D005399:Fishes; D000882:Haplorhini / Q000166:cytology; D051379:Mice; D009474:Neurons / Q000139:chemically induced* / Q000166:cytology*; D051381:Rats; D012154:Reticular Formation / Q000166:cytology*; D012754:Sharks; D013116:Spinal Cord / Q000166:cytology