Schematic Luschka in representation of the joints of the coronal plane.

posterior spinal canal border is formed at the spot where the laminae meet to form the spinous process—the spinolaminar line (Figure 1-10).

The Thoracic Spine

There are twelve thoracic vertebrae. The lower thoracic vertebrae are larger than the upper thoracic vertebrae and resemble the lumbar vertebrae. The thoracic spine has less mobility than the cervical or the lumbar spine. Its stability is enhanced mostly through the rib attachments and their connection to the sternum and also by the coronally oriented facet joins. As a result of its limited mobility the thoracic spine does not tend to degenerate as much as the cervical and lumbar regions. In the anteroposterior (AP) view, the thoracic pedicles appear as vertically oriented dense calcific oval rings that are perpendicular to the vertebral bodies (Figure 1-11). The distance between the pedicles should be evaluated. Increased interpedicular distance may suggest the presence of an expanding intraspinal lesion. All the pedicles should be visible in

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