sphenoethmoidal recess sphenoethmoidal recess the sphenoethmoidal recess is a small space in the nasal cavity into which the sphenoidal sinus and posterior ethmoid sinus open. it lies posterior and superior to the superior concha. the sphenoethmoidal recess drains the posterior ethmoid air cells and sphenoid sinuses into the superior meatus of the nasal cavity. sphenoethmoidal recesslateral wall of nasal cavity (sphenoethmoidal recess labeled at top)detailsidentifierslatinrecessus sphenoethmoidalista98a06.1.02.022 a02.1.00.094ta2499fma59734anatomical terminology