Fig. 1.  Three-quarter oblique view (A ) and posterior view (B ) of adjacent lumbar vertebrae. The interlaminar space is located posteriorly and is bounded by the bases of the spinous processes, the laminae, and the inferior articular processes. It is roofed over by the ligamentum flavum. The interspinous space lies in the midline and is filled by the supraspinous and interspinous ligaments. The intervertebral foramina are located laterally and are bounded by the pedicles, the vertebral body, the laminae, and the superior and inferior articular processes and contain the spinal nerve roots and their accompanying blood vessels. (Image used with permission from www.usra.ca.)