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This 3D medical animation shows a lumbar laminectomy back surgery procedure. Beginning with an orientation of the lumbar spine, the animation shows boney spurs, a left side disc herniation and boney tumors that impinge the dorsal nerve root, causing pain sensations to flow down the left leg. The surgical correction of this condition requires a portion of the lamina of the vertebra to be cut away, and the herniated disc material to be removed.