Definition of the landmarks used in the present study.

Anterior, posterior and lateral SCCs (semicircular canals) were noted respectively ASCC, PSCC and LSCC. Landmarks of Type I were well defined locally; their homology from individual to another was strongly supported. Type II landmarks was corresponding to points which position was first defined locally using specific structures but it was also depending on less specific factors such as the maximum or minimum of a curve. When using type II landmarks the individual to individual homology was only supported geometrically, to calculate plane coordinates for example.