Sphenoid sinus
Introduction The sphenoidal sinuses (lat. Sinus sphenoidalis) are already preformed cavities in the skull of every human, more precisely in the interior of the sphenoidal bone (Os Sphenoidale). The sphenoidal sinus is arranged in pairs, i.e. there is one on the left and another on the right side of the skull. The two cavities are … Sphenoid sinus