Sphenoidal air sinuses are large, irregular cavities hollowed out of the interior of the body of the sphenoid bone, and are separated from each other by a bony septum. They vary considerably in form and size and are often partially subdivided by irregular bony laminae. A round opening is present at the upper part of each sinus by which it communicates with the upper and back part of the nasal cavity and occasionally with the posterior ethmoidal air cells. The posterior ethmoid artery supplies the roof of the sphenoid sinus while the rest of the sinus is supplied by the sphenopalatine artery.
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