Incidence of separate neural arch in the lumbar vertebrae of Eskimos

✍ Scribed by T. D. Stewart

• Publisher: John Wiley and Sons
• Year: 1931
• Tongue: English
• Weight: 566 KB
• Volume: 16
• Category: Article
• ISSN: 0002-9483
• DOI: 10.1002/ajpa.1330160116

✦ Synopsis

By the phrase 'separate neural arch' most writers in English refer to an anomaly which has its greatest frequency in the lumbar vertebrae, but which has been reported as occurring also in other segments of the column. The term ' spondylolysis ' (or ' spondiloschise ' of Neugebauer ) has been applied to this condition, especially by foreign writers, and usually to indicate its relationship to spondylolisthesis. Thus, separate neural arch and spondylolysis both designate the condition in which there is found a break in continuity of the neural arch, usually between the superior and inferior articular processes Bnd either on one or both sides. When this defect is present on both sides, the vertebra consists of two parts, of which the larger ventral portion is formed by the vertebral body with the pedicles, transverse processes, and superior articular processes, while the smaller dorsal portion contains the inferior articular processes, laminae, and spinous process.

When the two part-components of an anomalous vertebra become separated through displacement of the body ventralward, while the inferior articular processes retain their posi-'Read before the second meeting of the American Association of Physical Anthropologists, Cleveland, 1930.