abnormal rhombomere morphology MP:0000933 MPheno.ontology abnormal rhombomeres any structural anomaly of any of the transiently divided segments of the developing neural tube of vertebrate embryos found within the hindbrain region in the area that will eventually become the rhombencephalon; the rhombomeres appear as a series of slightly constricted swellings in the neural tube, caudal to the cephalic flexure rhombomere dysplasia abnormal neuromere morphology abnormal hindbrain development