Formation of the Paranasal Air Sinuses
Some of the reasons why the ethmoid labyrinths should not be considered sinuses of the ethmoid bone have been discussed earlier (see Chap. 10). According to this concept, humans have only three pairs of paranasal air sinuses: the maxillary, frontal, and sphenoid sinuses. More arguments supporting that paranasal air sinuses are structures different from the ethmoid complex, and that they have a different origin, are presented here. The paranasal air sinus is a specific entity.
KeywordsNasal Cavity Paranasal Sinus Sphenoid Sinus Frontal Sinus Olfactory Organ
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