"The importance of a clear understanding of anatomical structures and relationship in and adjacent to the oral cavity is obviously indispensable in the practice of any phase of operative dendistry. Whether primary interest focuses on the ploblems of orthodontia, peridontia, prothodontia, or oral surgery, an acurate visual image of the parts involved is equally imperative. The bony foundation... the muscular and connective tissue investment... the intricate blood and nerve supply... the dentural organization... these, and many other details must be thoroughly comprehended and properly appraised in terms of their functional implications."