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 Political Parties in the United States Congress: 1789-1989 Clear Politics selected the political party atlas as one of the 15 most influential/indispensable books on the subject of American election analysis (ranked #10). The Eightieth Congress illustration is an example of the election maps found in The Historical Atlas of Political Parties in the United States Congress: 1789-1989. In the atlas there are one hundred large national four-color district election maps for the House of Representatives, and one hundred smaller state election maps for the Senate, for each of the first one hundred congresses. The maps are based upon the results tabulated on the regular Election Day. The Eightieth