abnormal cochlear hair cell morphology abnormal cochlear hair cell stereociliary bundle morphology 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 MPheno.ontology abnormal cochlear hair cell stereocilia MP:0004521 abnormal cochlear hair cell stereociliary bundles abnormal cochlear hair bundles