ENT General 16ce8442

First paranasal sinus to develop at bih is:

Maxillary

Ethmoidal

Frontal

Sphenoidal

High-Yield Explanation

Development of SinusesSinusGestational Month WhenDevelopment StasPresent in ClinicallySignificant SizeFully DevelopedMaxillary2degBihdeg12 yearsdegEthmoid30Bihdeg12 yearsdegFrontal4deg3 yearsdeg18-20 yearsdegSphenoid3deg8 yearsdeg12-15 yearsdeg

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First paranasal sinus to develop at bih is:

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