Principles and practice of spinal adjustment; for the use of students and practitioners . ofthe vertebrae in this region. There are, however, cases inwhich by palpation of the transverse processes a vertebrain this region is found to be anterior, but this is usually athinning of the anterior portion of the disc as a result ofwhich the anterior part of the vertebra which rests upon thatdisc is displaced downward, while its posterior portion israised and brought forward; thus the spinous and transverseprocesses will be felt as being close to those of the vertebraabove the one affected. In the lu
Principles and practice of spinal adjustment; for the use of students and practitioners . ofthe vertebrae in this region. There are, however, cases inwhich by palpation of the transverse processes a vertebrain this region is found to be anterior, but this is usually athinning of the anterior portion of the disc as a result ofwhich the anterior part of the vertebra which rests upon thatdisc is displaced downward, while its posterior portion israised and brought forward; thus the spinous and transverseprocesses will be felt as being close to those of the vertebraabove the one affected. In the lumbar region of the spine the length of the inferiorarticular processes, and their convex surface fitting into theconcavity on the tip of the superior processes of the vertebra 272 SPINAL ADJUSTMENT below, effectively prevent any forward displacement of avertebra in this region. The fifth lumbar vertebra is, how-ever, an exception to this rule. This vertebra is wedge-shaped,the thicker portion of its body being anterior. This naturallywill favor a forward displacement of this Fig. 48. Anterior Subluxation. The most likely place in which a pure anterior displace-ment of a vertebra could occur is at the atlas. Here a laxityof the transverse ligament will permit a forward displace-ment of the atlas upon the condyles of the occiput. It mustbe understood that by this only a slight displacement is im-plied, since a pronounced displacement would necessarilycause a compression of the medulla between the posteriorarch of the atlas and the odontoid process of the axis. VERTEBRAL SUBLUXATIONS 273 In an anterior subluxation the antero-posterior diameterof the intervertebral foramina is encroached upon and thenerves and vessels transmitted by them are the subluxation is in the cervical region, the vertebralarteries are also pressed upon, and the circulation to the brainis interfered with. Fig. 48. Posterior Subluxation.—In a posterior subluxation the in-ferior ar
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