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chemoreceptor basiliar membrane otolithic membrane mechanoreceptors ampullae stereocilia Both rotational and gravitational balance are dependent on Gravitational balance is achieved when calcium carbonate otoliths Rotational balance is achieved when head movement causes fluid to move within one of the three causing displacement of sterocilia within one of the or enlarged bases to sag and stereocilia to bend in response. In both types of equilibrium, the brain uses information from these motor responses semicircular canals within the ear. are displaced, causing the to generate appropriate