Abstract
The mucosa lining the oral cavity varies significantly in its structure and function. In some areas of the mouth, it protects the underlying structures; in others, it provides a means of transepithelial absorption and around the teeth it provides a unique epithelial structure and controls passage of crevicular fluid. This chapter reviews briefly the major structural characteristics of the cells of oral epithelium and connective tissue. The elementary cell mechanisms and functions of keratinocytes and every cell of the connective tissue are also briefly analyzed.