Abstract
Ca 2+ is critical for mechanosensory adaptation, frequency tuning, afferent synaptic transmission, and efferent modulation in hair cells. These four processes involve cytoplasmic Ca 2+ in three independent signalling pathways. Recent work suggests that Ca 2+ regulates a myosin adaptation motor, and that a mobile Ca 2+ buffer is highly concentrated in hair cells. Focal Ca 2+ entry and the cytoplasmic Ca 2+ buffer help to separate these pathways by limiting the spread of Ca 2+ signals.
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