It starts at the bottom of the sixth thoracic vertebrae and the last three or four ribs and covers the width of your middle and lower back. This is the large, flat, wide triangular-shaped muscle. The muscles that attach to your lumbar spine include: Your muscles and ligaments provide strength and stability to your lower back and allow you to bend forward, backward and rotate. Your lumbar muscles, along with your abdominal muscles, work to move your trunk and lower back. What are the muscles and other soft tissues of the lumbar spine? Muscles of your lumbar spine The nerves that branch off of your lower spinal cord and cauda equina control leg sensations and movement. This “tail of nerves” is called the cauda equina. The vertebrae in your spine also provide a bony enclosure for the individual nerves that descend from the end of your spinal cord. Your spinal cord, which is encircled and protected by the bones of your spine, starts at the base of your skull and ends at the first lumbar vertebra.
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