Cisterna chyli is a Latin term that describes a sac-like structure located at the base of the thoracic duct and at the lower end of the spine in the abdomen. It's responsible for draining the lymphatic fluid from the lower extremities and abdominal organs into the bloodstream. Synonyms for the cisterna chyli include the lymphatic sac, dilated cisterna, and receptaculum chyli. The cisterna chyli is an essential component of the lymphatic system that helps regulate fluid balance in the body. Understanding the various terms used to describe this structure can be helpful in medical communication and understanding its essential role in the human body.