What is the number of lumbar vertebrae in the lower back?

The lumbar region of the spine is comprised of five vertebrae, typically denoted as L1 through L5. These vertebrae are larger and more robust than those in the cervical and thoracic regions, as they bear more weight and provide support for the upper body's structure. This characteristic allows them to accommodate activities such as lifting and bending. The lumbar vertebrae are critical in facilitating movement and providing flexibility while also protecting the spinal cord and nerves. Understanding the anatomy of the lumbar spine is essential for anyone working in physical therapy, as it informs treatment methods for back pain and other musculoskeletal issues commonly encountered in patients.