Axis (anatomy) The condition, where the dens is separated from the body of the axis, is called os odontoideum, and may cause nerve and circulation compression syndrome. On its anterior surface is an oval or nearly circular facet for articulation with that on the anterior arch of the atlas. On the back of the neck, and frequently extending on to its lateral surfaces, is a shallow groove for the transverse atlantal ligament which retains the process in position. The apex is pointed, and gives attachment to the apical odontoid ligament; below the apex the process is somewhat enlarged, and presents on either
The Historical Atlas of China states are often given overly precise and extensive outer borders, often based on contentious claims. In his afterword to volume 8, written in 1987, Tan regretted expanding the borders of Chinese empires to encompass "jimi" and "tusi" regimes. These Wikipedia maps are drawn after "The Historical Atlas of China" (1982). Works cited The Historical Atlas of China The Historical Atlas of China () is an 8-volume work published in Beijing between 1982 and 1988, edited by Tan Qixiang. It contains 304 maps and 70,000 placenames in total. The "Concise Historical Atlas of China" () was published in 1991. The atlas