Copyright (c) 2013 Authors: Alberto Prats-Galino(1), Miguel Angel Reina(2), Marija Mavar Haramija(1), Anna Puigdellivol-Sánchez(1), Joan San Molina(3) and José Antonio De Andrés(4). 1 Laboratory of Surgical NeuroAnatomy (LSNA), Human Anatomy and Embryology Unit, Faculty of Medicine, Universitat de Barcelona, Barcelona, Spain. 2 Department of Clinical Medical Sciences and Applied Molecular Medicine Institute, CEU San Pablo University School of Medicine, Department of Anaesthesiology, Madrid-Montepríncipe University Hospital, Madrid, Spain. 3 Department of Medical Sciences, Faculty of Medicine. Universitat de Girona, Spain. 4 Department of Critical Care and Multidisciplinary Pain Management, General University Hospital, Valencia, Spain. This document can be used to: - print content in hight quality - capture screenshots - insert, delete and rotate pages - insert comments - present content in educational purposes under the following conditions: - you may not use this work for commercial purposes - If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one (BY NC SA, http://creativecommons.org/licenses/by-nc-sa/2.0/) This document MUST NOT be used to: - modify, copy or in any way reuse the JavaScript code - reuse the anatomical 3D virtual geometric models contained in the document In order to access the instructions file from the interactive document, both have to be placed in the same directory. All the documents can be downloaded from: (http://diposit.ub.edu/dspace/handle/2445/44844?locale=en).