vestibular hair cell stereociliary bundle morphology trait vestibular hair cell stereocilia morphology trait vestibular hair bundle morphology trait Trait.ontology Any measurable or observable characteristic related to the shape, structure, color or pattern of the mechanosensitive hair bundles which are composed of thick long microvilli (stereocilia) and are located at the apical end of vestibular hair cells of the utricle and saccule. VT:0001445 vestibular hair cell morphology trait