sphenoid sinus

sphenoid sinus
sphenoid sinus or sphenoidal sinus n either of two irregular cavities in the body of the sphenoid bone that communicate with the nasal cavities

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sphenoidal sinus, sinus sphenoidalis [TA] one of the paired paranasal sinuses in the anterior part of the body of the sphenoid bone, communicating with the superior meatus of the nasal cavity on the same side; the two are separated from each other by a septum.

Medical dictionary. 2011.

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