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Fig. 5 Diagram of a projection-based model of hair cell innervation. (A) During their rearrangement, hair cells make few transient contacts and no stable contacts with afferent terminals. (B) Following the completion of rearrangement, hair cells develop basal projections. (C) The projections extend toward aggregations of afferent neurons at neighboring hair cell synapses. (D) Filopodia from afferent terminals extend along the projections toward the hair cell somata. (E) Afferent filopodia reach the available presynaptic sites at the bases of the projections. (F) Afferent terminals form stable contacts at presynaptic sites, and the hair cell projections retract.