The L5 vertebra is the fifth lumbar vertebra located in the lower back, part of the lumbar spine. It plays a crucial role in supporting the weight of the upper body and allows for flexibility and movement. The L5 vertebra connects to the sacrum below it and the L4 vertebra above it, forming a vital part of the spinal column. This vertebra is larger than the others in the lumbar region, as it bears more weight. It also has a unique shape that helps with stability and movement. Issues with the L5 vertebra can lead to back pain or other spinal problems, affecting overall mobility.