part_of part of part of has_part has part has part develops_from develops from develops from contributes to morphology of immediate transformation of brain hindbrain rhombencephalon The most posterior of the three principal regions of the brain. In mammals and birds the hindbrain is divided into a rostral metencephalon and a caudal myelencephalon. In zebrafish, with the exception of the cerebellum, the ventral remainder of the metencephalon can be separated only arbitrarily from the more caudal myelencephalic portion of the medulla oblongata (From: Neuroanatomy of the Zebrafish Brain)[ZFA]. Organ component of neuraxis that has as its parts the pons, cerebellum and medulla oblongata[FMA]. brainstem regional part of brain presumptive hindbrain structure with developmental contribution from neural crest