The lumbar vertebral bodies are taller and bulkier compared to the rest of the spine. Lower VertebraeĮach vertebra is formed by a round block of bone, called a vertebral body. This condition doesn't usually cause any particular problems. Some people have an extra, or sixth, lumbar vertebra. The lowest vertebra of the lumbar spine, L5, connects to the top of the sacrum, a triangular bone at the base of the spine that fits between the two pelvic bones. Doctors often refer to these vertebrae as L1 to L5. The lumbar spine is made up of the lower five vertebrae. An inward curve of the spine is called lordosis. The low back, also called the lumbar spine, curves slightly inward. The outward curve of the thoracic spine is called kyphosis. The middle back, or thoracic spine, curves outward. The neck, called the cervical spine, curves slightly inward. The spinal column is the body's main upright support.įrom the side, the spine forms three curves. Vertebrae are stacked on top of one another to form the spinal column. The human spine is made up of 24 spinal bones, called vertebrae. This section highlights important structures in each category. The important parts of the lumbar spine include:
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