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Spinal stenosis is the narrowing of spaces in the spine (backbone) which causes pressure on the spinal cord and nerves. About 75% of cases of spinal stenosis occur in the low back (lumbar spine).
Medulla spinalis. A spinal nerve with its anterior and posterior. The motor tract. Diagrammatic transverse section of the medulla spinalis and its membranes. A portion of the spinal cord, showing its right lateral surface. The dura is opened and arranged to show the nerve roots. Scheme showing structure of a typical spinal nerve.