L4

L4 refers to the fourth lumbar vertebra in the lower back. It's part of the spine's lumbar region, supporting much of the body's weight and allowing for movement and flexibility. The L4 vertebra works closely with adjacent vertebrae, nerves, muscles, and tissues to help you bend, twist, and stay upright. Issues in L4, such as herniation or degeneration, can cause lower back pain or nerve-related symptoms like numbness or weakness in the legs and feet. Understanding L4 is important for diagnosing and treating back problems effectively.