The lumbar neural arch consists of paired pedicles and laminae forming the posterior bony ring around the spinal canal. The pedicles project posterolaterally from the vertebral body, and the laminae extend posteromedially to join at the spinous process. The neural arch contains the spinal canal and provides the structural foundation for the posterior elements.
The lumbar neural arch is the surgical territory for laminectomy, laminotomy, and pedicle screw instrumentation. Pedicle screws traverse the pedicle from posterolateral to anteromedial within the vertebral body, requiring precise knowledge of pedicle anatomy. The pars interarticularis at the pedicle-lamina junction is the site of spondylolysis stress fractures. Burst fractures disrupt the posterior wall of the neural arch, risking retropulsion of bone into the spinal canal.
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