本文报告3例见于枕骨斜坡面正中矢状位的骨管,前此未见诸文献记载。3例骨管均位在斜坡面下半部,骨管上口约平齐耳门下缘,骨管下口籍骨沟续向枕骨大孔前缘。作者就穿行骨管内的结构,骨管的性质与意义等方面进行了讨论。目前,可名之为“斜坡(面)下正中管”。 This article reports 3 cases found in the medial sagittal occipital slope of the skull, no previous documented. 3 cases of cortical bone are located in the lower half of the ramp, the upper mouth of the bone canal is about the same as the lower edge of the ear canal, and the mouth of the bone canal leads to the front of the foramen magnum. The authors discussed the structure of the trabecular bone and the nature and significance of the bone canal. At present, it can be called “the middle of the slope (surface) tube.”