Peter H. Abrahams, MBBS, FRCS(ED), FRCR, DO(Hon), FHEA, Professor Emeritus of Clinical Anatomy, Institute of Clinical Education, Warwick Medical School, University of Warwick, Coventry, United Kingdom, Jonathan D. Spratt, MA (Cantab), FRCS (Eng), FRCS (Glasg), FRCR, Consultant Clinical Radiologist, University Hospital of North Durham, UK , Examiner in Anatomy, Royal College of Radiologists Visiting Fellow in Radiological Anatomy, University of Northumbria, UK , Visiting Professor of Anatomy, St George's Medical School, Grenada, West Indies, Marios Loukas, MD, PhD, Professor of Anatomical Sciences, Dean of Basic Sciences, School of Medicine, St George's University, Grenada, West Indies, Albert-Neels van Schoor, BSc MedSci, BSc (Hons), MSc, PhD, Senior Lecturer, Department of Anatomy, School of Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria, Gauteng, South Africa and Ralph T. Hutchings, Photographer and Contributor to www.VisualsUnlimited.com; Formerly Chief Medical Laboratory Scientific Officer, Royal College of Surgeons of England, London, UK