对３２个颅骨（６４例）乙状窦后区进行了观测，并以星点、颞枕线、乳突前后缘为参考点，描述了该区域的体表投影。观测结果提示乙状窦后手术入路在颞枕线上距星点下方１．８４ｃｍ，距乳突前垂直线（相当于耳后沟）２．２ｃｍ左右的范围内钻孔，既能充分暴露视野，也比较安全，可避免损伤乙状窦。 The posterior segment of sigmoid sinus in 32 skull (64 cases) was observed. The surface projection of this region was described by using the star point, temporal pillow line and anterior and posterior edge of mastoid as reference points. Observations suggest that the sigmoid sinus surgery approach in the temporal pillow line from the bottom of the star 1.84cm, from the mastoid anterior vertical line (equivalent to the ear ditch) 2.2cm range of drilling, both fully exposed Field of vision, but also more secure, to avoid damage to the sigmoid sinus.