![]() They pass through small holes in the back of the lower spine. There are nerves that branch off from the spinal column at each level of the spine.The facet joints of the lumbar spine allow movement to bend and twist the low back in all directions. The two adjacent vertebrae are connected in the back of the spine by two small joints called facet joints.It acts like a shock absorber in the spine, allowing flexibility and providing protection from jarring movements. A healthy disc is cushiony, with a lot of water, and has a sponge-like substance. Two vertebrae, such as L4-L5, stacked vertically with an intervertebral disc between them.L1, L2, 元, L4, and L5).Įach lumbar spine segment is comprised of: The lumbar spine has 5 intervertebral segments, termed lumbar segment 1 through 5 (e.g. Physicians usually explain a patient’s pathology by focusing on one intervertebral segment, or spinal segment. This inward curve of the spine is called lordosis. The lower spine curves slightly inward, toward the abdomen. Because the spinal cord does not run through the lumbar spine, it is quite rare that a lower back problem would result in spinal cord damage or paralysis. These nerves extend to the lower extremities (buttocks, legs and feet). At that point numerous nerve roots from the spinal cord continue down and branch out, forming the “cauda equina,” named for its resemblance to a horse’s tail. The spinal cord travels from the base of the skull through the spinal column and ends at about T12-L1 – where the thoracic spine meets the lumbar spine. This joint allows for considerable rotation, so that the pelvis and hips may swing when walking and running. The lumbar spine meets the sacrum at the lumbosacral joint (L5-S1).The lumbar spine’s lowest two spinal segments, L4-L5 and L5-S1, which include the vertebrae and discs, bear the most weight and are therefore the most prone to degradation and injury. ![]() The five vertebrae of the lumbar spine (L1-L5) are the biggest unfused vertebrae in the spinal column, enabling them to support the weight of the entire torso.
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