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Measurements made on control and scala communis ears. a, d Cochlear area (CoA; yellow line) and modiolar area (MoA; black line). b, e Angles of interscalar ridges R2 and R3 (yellow lines). c, f Distances AB and AC (yellow lines). T1: tangent to upper basal and upper middle turns. T2: tangent to lower basal and upper basal turns. AB is perpendicular to T1, and AC is perpendicular to T2.
