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Paranasal sinuses figure 911 Diagram Quizlet · The paranasal sinus region is one of the most complex areas of the human body and is consequently very difficult to study The surgical anatomy of the nose and paranasal sinuses is published with great detail in most standard textbooks, but it is the purpose of this chapter to describe those structures in a very clear and systematic presentation focused for the endoscopic sinus · The paranasal sinuses are air cavities that help circulate the air that is breathed in and out of the respiratory system They are situated around the nasal cavity and they are all paired and sometimes symmetrical, while always being bilateral There are four different pairs of sinuses and they are called the maxillary sinuses frontal sinuses Nose And Paranasal Sinuses Cross Section Anatomy paranasal sinuses diagram