The distance from the inforior pole sphenoidal sinus aperture to the sphenopalatine foramen was(.0±.0,8.0-. ) mm. The di蝶腭孔至蝶窦口下极的距离为(.0±.0,8.0~. )mm,在蝶腭孔处蝶腭动脉的外径为(.99±0. ,.0~.80)mm;