Comparison of afferent morphometric parameters by type. Area = innervation area (μm2, divided by a factor of 10); Axon Vol = total fiber volume (μm3, divided by a factor of 10); Length = total fiber length (μm, divided by a factor of 10); Branches, Terminals, Boutons, = total number of fiber branches, terminals, and boutons, respectively; Type I HC = number of type I hair cells per fiber; Diameter = average diameter (μm) of parent axon; Branch order = level of bifurcations.