The distances from internal carotid artery to sphenopalatine foramen, from internal carotid artery to anterior nasal spur, and from foramen rotundum to anterior nasal spur were 16.66 2.65mm, 66.94 5.35mm, and 62.90 3.81 mm respectively.

• 颈内动脉虹吸弯与蝶腭孔之间的距离为16.；66±2