opening of the sphenoidal sinus

o·pen·ing of the sphe·noi·dal si·nus

[TA] 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(s): apertura sinus sphenoidalis [TA], sphenoidal sinus aperture