. Atlas and text-book of human anatomy. Anatomy -- Atlases. 24 ATLAS AND TEXT-BOOK OF HUMAN ANATOMY. Fig. 4.—The cervical vertebras seen from behind and partly from the side (f). Fig. 5.—The fifth cervical vertebra seen from above (|). Fig. 6.—The seventh cervical vertebra seen from above (y). Fig. 7.—The atlas seen from above (y). Fig. 8.—The axis seen from above (y). bodies are relatively small, low, oblong (or quadrilateral with rounded corners), and they in- crease in size from above downward. The bodies are smaller than in any other region of the spine, and their upper surfaces are concav
. Atlas and text-book of human anatomy. Anatomy -- Atlases. 24 ATLAS AND TEXT-BOOK OF HUMAN ANATOMY. Fig. 4.—The cervical vertebras seen from behind and partly from the side (f). Fig. 5.—The fifth cervical vertebra seen from above (|). Fig. 6.—The seventh cervical vertebra seen from above (y). Fig. 7.—The atlas seen from above (y). Fig. 8.—The axis seen from above (y). bodies are relatively small, low, oblong (or quadrilateral with rounded corners), and they in- crease in size from above downward. The bodies are smaller than in any other region of the spine, and their upper surfaces are concave from side to side and slightly convex from before backward, while the lower surfaces are concave from before backward and slightly convex from side to side. As a consequence of this, the upper surface of ever}^ vertebra projects laterally beyond the body of the vertebra next above (Figs. 3 and 4)- The arches of the cervical vertebras (Fig. 5) are of medium height and arise by a pedicle which is directed outward and backward. Together with the body, the arch surrounds a spinal foramen which is very wide, especially in its transverse diameter. The articular processes (with the ex- ception of those of the upper two vertebrae) are placed obliquely, so that the plane of the articu- lation passes from above downward and from before backward, and the articular surfaces are consequently in a middle position between a hori- zontal and a frontal plane, those nearer the skull approaching the horizontal position, and those nearer the thorac'c vertebrae the frontal plane. The transverse processes (Figs. 5 and 6) of all the cer\ical A-ertebrae are perforated by a large round foramen (foramen transversarium)^ a pecuHarity which distinguishes the cervical from all other vertebrae. Furthermore, the ends of the transverse processes are prolonged into two tubercles separated by a groove (sulcus nervi spinalis) (Fig. 5), situated upon the surface of the transverse process. The anterior
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