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Sphenoidal sinus aperture

From Biology-Online Dictionary
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sphenoidal sinus aperture --> opening of the sphenoidal sinus

One of the pair of openings in the body of the sphenoid bone through which the sphenoid sinuses communicate with the sphenoethmoidal recess of the nasal cavity.

Synonym: apertura sinus sphenoidalis, sphenoidal sinus aperture.