Fig. 1

Schematic of the cochlear spiral of the camel with five points used to determine radii of curvature. Spiral Radii were calculated as follows: Five equally spaced points 1–5 were chosen on each of the first and last quarter turns of the estimated basilar membrane paths. The first point was chosen just apical to the cochlear hook. Two chords were constructed between points 1 and 3 and 3 and 5. Perpendiculars to the chords were constructed through points 2 and 4. The intersection of the two perpendiculars determined an area center of curvature from which the radius was decided