Fabrice Duparc1, Bruno Grignon2. 1. Laboratory of Anatomy, Faculty of Medicine, Rouen University, 22 Boulevard Gambetta, 76183, Rouen, France. fabrice.duparc@univ-rouen.fr. 2. Department of Medical Imaging, Nancy University Hospital, 29 avenue du Maréchal de Lattre de Tassigny, 54035, Nancy, France.