immediate transformation of Danio rerio ectoderm-derived structure segmental subdivision of hindbrain myelencephalon http://upload.wikimedia.org/wikipedia/commons/5/54/EmbryonicBrain.svg HBA:9512 The early development of most vertebrate brains is similar (...). The zebrafish neural tube follows the same basic differentiation pattern as the mammalian neural tube (reference 1); The brain develops from three embryonic enlargements of the neural tube, which later differentiate into five regions. A forebrain differentiates into telencephalon and diencephalon. The midbrain, or mesencephalon, remains undivided. The hindbrain divides into the metencephalon and myelencephalon. Cavities within the brain enlarge to form a series of interconnected ventricles (reference 2).[well established][VHOG] The posterior part of the developing vertebrate hindbrain or the corresponding part of the adult brain composed of the medulla oblongata and a portion of the fourth ventricle; as well as the glossopharyngeal nerve (CN IX), vagus nerve (CN X), accessory nerve (CN XI), hypoglossal nerve (CN XII), and a portion of the vestibulocochlear nerve (CN VIII).[BTO,WP]. DHBA:10662 VHOG:0000456 MA:0000205 CALOHA:TS-2365 The posterior of the two brain vesicles formed by specialization of the rhombencephalon in the developing embryo, it comprises the medulla oblongata. [TFD][VHOG] BTO:0000758 uberon EMAPA:17082 the terms metencephalon and myelencephalon are only meaningful in mammals and birds - Neuroanatomy of the Zebrafish Brain. Note that its not clear if this refers to the developing medulla oblongata - MA (adult) has two distinct classes UBERON:0005290 EHDAA:5526 EHDAA2:0001207 myelencephalon (medulla oblongata) CALOHA:TS-0607 Wikipedia:Myelencephalon future myelencephalon structure with developmental contribution from neural crest