This textbook is written for medical students. It presents the main facts and concepts in a concise straightforward style. The first edition has had an encouraging reception by students, especially those for whom English is a foreign language. The presentation of major chapters, in manageable lengths, makes the book most attractive to students who find some books rather lengthy due to detail and inclusion of information not required by the medical curriculum. This second edition is more focused and has made use of valuable feedback from students and teachers who have been using the book over the last few years. All the chapters have been thoroughly revised and new illustrations and summary diagrams have been added.