This updated fourth edition best-selling text and atlas is refined in several ways. Many chapters are completely revised, and nearly half of the photographs are new. There are approximately 189 atlas plates, and over 70 new illustrations. Text boxes read as 'Clinical Correlation' or 'Functional Correlation', and in the text, emphasis is placed on functional integration with increased coverage of cell and molecular biology. The sentence heading and four-color art have been retained from the previous edition.