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What is the lumbar spine, and what is lumbar spinal stenosis?
The lumbar spine is made up of five vertebral bodies in the lower back. Nerves coming off the spinal cord travel though the spinal canal and exit the canal through small openings on the sides of the vertebrae called foramina (singular = foramen). These nerves transmit sensations from the buttocks and lower extremities through the spinal cord to the brain and transmit motor signals from the brain to the lower extremities to produce movement of the legs, toes, and joints of the lower extremities.
Lumbar spinal stenosis is a condition whereby either the spinal canal (central stenosis) or one or more of the vertebral foramina (foraminal stenosis) becomes narrowed. If the narrowing is substantial, it causes compression of the spinal cord or spinal nerves, which causes the painful symptoms of lumbar spinal stenosis, including
low back pain, buttock pain, and leg pain and numbness that is made worse with walking and relieved by resting.