How many movable vertebrae are found in the lumbar spine?

The lumbar spine is comprised of five movable vertebrae, typically labeled L1 through L5. These vertebrae play a crucial role in the support of the lower back and provide the primary area of motion and flexibility in the spine. The lumbar vertebrae are larger and stronger compared to those in the cervical and thoracic regions, as they bear a significant amount of the body's weight and endure stress from activities such as lifting and twisting.

Having five movable vertebrae in the lumbar region is essential for proper biomechanics and maintaining stability during movement. Understanding this structure is critical for anyone in the field of chiropractic care, as it directly relates to diagnosing and treating lower back issues. The other choices do not accurately represent the anatomical structure of the lumbar spine, as there are no three, seven, or twelve movable vertebrae in that region.