Abstract
Good understanding of the antomy of the paranasal sinues is the basis for endoscopic sinus surgery (ESS) . Antomical terminlogy of the paranasal sinuses has not always been clearly defined so far and, in some cases, confusing. The word inf undibulum has been used to indicate different places in the paranasal sinuses. The author tried to clear the difficulties and explain the anatomy of the paranasal sinus in explicit way for practical use in ESS.
