. The anatomy of the human body. Human anatomy; Anatomy. and 64). But it can scarcely be distinguished, con- sisting only of a few ligamentous fibres among the fat of this region. 3. Lateral Occipito-atlantal Ligaments (c, Jig. 61). —A fibrous cord passes from the base of the trans- verse process of the atlas to the jugular process of the occipital bone. In connexion with a similar bun- dle from the pars petrosa, it forms a very remark- able fibrous canal, which gives passage to the in- ternal jugular vein, the internal carotid artery, the hypoglossal, pneumogastric, glosso-pharyngeal, and acc
. The anatomy of the human body. Human anatomy; Anatomy. and 64). But it can scarcely be distinguished, con- sisting only of a few ligamentous fibres among the fat of this region. 3. Lateral Occipito-atlantal Ligaments (c, Jig. 61). —A fibrous cord passes from the base of the trans- verse process of the atlas to the jugular process of the occipital bone. In connexion with a similar bun- dle from the pars petrosa, it forms a very remark- able fibrous canal, which gives passage to the in- ternal jugular vein, the internal carotid artery, the hypoglossal, pneumogastric, glosso-pharyngeal, and accessory nerves. 4. The union of the condyles of the occipital bone with the superior articular surfaces of the atlas is a double condyloid articulation. The articular surfaces of the occipital bone are the two condyles, convex, oblong, looking downward and outward, and directed for- ward and inward, so that their axes, if prolonged, would meet in front of the basilar process. The articular surfaces of the atlas are concave and oblong, and look upward and a little inward, so as to fit exactly upon the convexity of the condyles. Both are covered by a thin layer of cartilage. The ligaments are vertical fibres which surround the joint, but are most numerous in front and on the outside, for they scarcely exist on the inside and behind. There is also a very loose synovial membrane which passes beyond the articular surfaces on all sides, but especially to the outside. Atlanto-axoid Articulation. - Preparation.—After having studied the superficial ligaments, remove the laminae of the axis, the posterior arch of the atlas, and the back part of the foramen magnum. Detach with care that portion of the dura mater which corresponds to the first two vertebrae and the foramen magnum, and turn it upward. Lastly, in order to obtain a good view of the articulation of the odontoid process with the atlas, disarticulate the occipital bone. This articulation is formed between, 1. The odontoid pro
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