vestibular hair cell stereociliary bundle morphology trait 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. Trait.ontology VT:0001445 vestibular hair bundle morphology trait vestibular hair cell stereocilia morphology trait vestibular hair cell morphology trait