Plexus Lumbalis, commonly known as the lumbar plexus, is a network of nerves that branches out from the spinal nerves in the lower back and supplies sensation to the lower abdomen, groin, and legs. It is an important nerve pathway that has several synonyms, including the lumbar nerve plexus, lumbosacral plexus, and the sacral plexus. The lumbar plexus is formed by the lumbar spinal nerves and some fibers from the lower thoracic spine. The sacral plexus is formed by the sacral spinal nerves, which join up with the lumbar plexus. These synonyms of Plexus Lumbalis are often used interchangeably in medical literature and discussions.