There are 5 lumbar vertebrae in the lumbar region. There are 5 sacral vertebrae, which are fused as one bone and known as the sacrum, in the sacral region. There are 3 to 5 coccygeal vertebrae, which ...

The lumbar region is located between the thoracic (chest) region of the spine and the sacrum, a large bone at the base of the spine. The lumbar spine usually curves slightly inward, called lordosis.