The cysterna chyli is also called the cisterna chyli. This is a sac which receives lymph from both of the lumbar lymphatic trunks and the intestinal trunk. It can be found at the lower end of the thoracic duct. Lymph is a milky body fluid which contains a type of white blood cells, called lymphocytes, along with proteins and fats. Lymph plays an important role in the immune system and in absorbing fats from the intestines.