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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).
Pons is situated below the midbrain and above the medulla oblongata anterior to the cerebellum. It is mainly composed of those nerve fibers that connect the two halves of cerebellum. In addition, it also contains the ascending and descending fibers connecting the forebrain, midbrain and the spinal cord.edulla oblongata: It is the inferior-most component of brain that is continuous below with the spinal cord. Structurally, it is conical in shape and contains a median fissure on the anterior surface, on either side of which is a swelling called the pyramid.