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Accurately depicts a generic Smith-Robinson anterior cervical discectomy (diskectomy) and spinal fusion surgery.  Labels: vertebral body, intervertebral disc, spinous process, spinal cord, dura (thecal sac), and others. The four surgical steps shown are appropriate for vertebral levels C2 thorugh C7: A. Incision; B.Removal of disc material, decompressing the neural elements; C. Drilling of the vertebral endplates to expose cancellous bone; D. Bone graft placed between the vertebral bodies for fusion.