The lateral surfaces are separated from the posterior by the articular processes in the cervical and lumbar regions, and by the transverse processes in the dorsal. These surfaces present in front the sides of the bodies of the vertebral, marked in the dorsal region by the facets for articulation with the heads of the .ribs. More posteriorly are the intervertebral foramina, formed by the juxtaposition of the intervertebral notches, oval in shape, smallest in the cervical and upper part of the dorsal regions, and gradually increasing in size to the last lumbar.
They arc situated between the transverse processes in the neck, and in front of them in' the back and loins, and transmit the spinal nerves.
The base of that portion of the vertebral column formed by the twenty-four movable vertebral is formed by the under surface of the body of the fifth lumbar vertebra; and the summit by the upper surface of the atlas.
The vertebral or spinal ca.nal follows the different curves of the spine; it is largest in those regions in which the spine enjoys the greatest freedom of move¬ment, as in the neck and loins, where it is wide and triangular; and narrow and rounded in the back, where motion is more limited.
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