The paranasal sinuses are air filled extensions of the respiratory part of the nasal cavity there are four paired sinuses named according to the bone they are located in maxillary frontal sphenoid and ethmoid. The paranasal sinuses include the following types of sinuses a maxillary sinus in each cheek between six and 12 ethmoid sinuses on each side of the nose between the eyes. 1 paranasal sinuses anatomy and function glen t porter md francis b quinn md facs the university of texas medical branch department of otolaryngology. The maxillary sinuses anatomy the maxillary sinuses are the largest of the all the paranasal sinuses they have thin walls which are often penetrated by the long roots of the posterior maxillary teeththe superior border of this sinus is the bony orbit the inferior is the maxillary alveolar bone and corresponding tooth roots the medial border is made up of the nasal cavity and the lateral
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