The term "Vena Lumbalis" refers to a vein located in the lumbar region of the lower back. There are several synonyms that can be used to refer to this vein, including lumbar vein, vertebral vein, and iliolumbar vein. The lumbar vein is responsible for draining blood from the lower back region and re-routing it to the heart. The vertebral vein runs parallel to the vertebral column and is involved in the drainage of blood from the spinal cord. Finally, the iliolumbar vein is responsible for the drainage of blood from the pelvis and the lower back. All of these veins play a vital role in the circulation of blood around the human body.