abnormal hindbrain morphology MP:0000841 MPheno.ontology abnormal rhombencephalon morphology any structural anomaly of the part of the brain developed from the posterior of the three primary brain vesicles of the embryonic neural tube from which the metencephalon and myelencephalon are derived; the metencephalon (anterior part of the embryonic hindbrain), gives rise to the cerebellum and pons while the myelencephalon (posterior portion of the embryonic hindbrain) gives rise to the medulla oblongata hindbrain dysplasia abnormal brain morphology