Lumbar lymph nodes refer to a group of small organs that are part of the immune system. Lymph nodes are generally circular, bean-like organs that are dispersed throughout the body.

The human body is an incredibly designed machine, and mechanical processes such as those in the lymphatic system play major roles in maintaining healthy tissue and organs.

The scientists named it the glymphatic system, a nod to the body's lymphatic system, which helps fight infection, maintain fluid levels and filter out waste products and abnormal cells.