abnormal cochlear hair cell morphology abnormal cochlear hair cell stereociliary bundle morphology MP:0004521 MPheno.ontology abnormal cochlear hair bundles abnormal cochlear hair cell stereocilia abnormal cochlear hair cell stereociliary bundles any structural anomaly or disruption of the typical pattern of arrangement of mechanosensitive hair bundles which are composed of thick long microvilli (stereocilia) and are located at the apical end of cochlear inner and outer hair cells