This is an authoritative guide to the field of medicine and its specialties. While drawing on the strengths of previous medical companions, it has been rethought and redesigned. With a greater emphasis on the history of medicine, its cultural links with the arts and music, and its international nature, this edition has been completely rewritten under the auspices of the distinguished editorial team headed by Stephen Lock. More than 200 contributors have contributed over 500 substantial articles and many more shorter ones, ranging from abortion to zygote. All the major medical and nursing specialties are covered, and detailed attention is given to complementary therapies, national medical systems, and the historical development of medicine. The clear and appealing layout and comprehensive cross-referencing ensure that information can be found quickly and easily. Features in this edition include special "Breakouts" that highlight key discoveries, diseases, and technologies. And many carefully researched illustrations complement the text, ensuring that the book is highly attractive as well as informative.