![]() ![]() The procedure involves removing part of all of the lamina at the affected level and enlarging the space around the compressed nerves. Some people who have lumbar spinal stenosis may undergo a surgical procedure called decompressive laminotomy or laminectomy. The lamina, a thin bony plate shields or protects access to the spinal canal. These processes and vertebral arches create the hollow spinal canal for lumbar nerves structures and the cauda equina.ĭetailed views of the lumbar spinal column and bony anatomy. However, the posterior bony structure is different-lamina, pedicles and bony processes project off the back of the vertebral body. From the front (or anterior), the vertebral body appears rounded. The low back vertebral bodies are larger, thicker block-like structures of dense bone. Each lumbar spinal level is numbered from top to bottom-L1 through L5, or L6. Most people have 5 lumbar levels (L1-L5), although it is not unusual to have 6. The lumbar spine is the lower back that begins below the last thoracic vertebra (T12) and ends at the top of the sacral spine, or sacrum (S1). ![]()
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