Aeration of which of the following paranasal sinus occur after bih?: (A) Frontal, (B) Ethmoid, (C) Maxillary, (D) Sphenoid
Answer is A. The onset of development of aeration of frontal sinus occur after bih and reaches adult configuration by adulthood. Developmental aeration of paranasal sinuses: Paranasal sinusOnset of developmentAdult configurationMaxillary sinusThird month of gestation12 years of ageSphenoidFouh month of gestationPubeyEthmoidFifth month of gestationPubey Ref: Atlas of Neuroradiologic Embryology, Anatomy, and Variants edited by J. Randy Jinkins page 45.