Science and technology are constantly changing fields. New research and experience broaden the scope of information and knowledge. The author has tried his best in giving information available to him while preparing the material for this book. Although, all efforts have been made to ensure optimum accuracy of the material, yet it is quite possible some errors might have been left uncorrected. The publisher, the printer and the author will not be held responsible for any inadvertent errors, or inaccuracies. Yogesh Sontakke MBBS, MD (Anatomy) is currently Additional Professor, Department of Anatomy, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Puducherry, an Institution of National Importance under the Ministry of Health & Family Welfare, Government of India. He is a compassionate teacher and admired by the students for chalk-n-board teaching. He is also a leading medical illustrator and known for stunning illustrations in anatomy. His constant perseverance, dedication and passion towards the field of teaching is reflected in his well read books: Textbook of Human Histology, Textbook of Human Embryology 2/e. Principles of Clinical Genetics 2/e, MCQs and Viva Voce in Human Embryology, Principles of Scientific Writing 2/e, and Principles of Histological Techniques. Immunohistochemistry and Microscopy.