abnormal hindbrain size decreased hindbrain size MP:0012263 small hindbrain MPheno.ontology size reduction or truncation 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 small rhombencephalon truncated rhombencephalon reduced rhombencephalon size csmith truncated hindbrain 2013-11-14T09:53:41Z decreased rhombencephalon size reduced hindbrain size