Which of the following duct commences in the abdomen as an elongated lymph sac of the cisterna chyli is?

The thoracic duct is the largest lymphatic vessel in the body.It extends from the upper pa of the abdomen to the lower pa of the neck,crossing the posterior and superior pas of the mediastinum.It is about 45 cm long.It has a beaded appearance because of the presence of many valves in its lumen. It begins as a continuation of the upper end of cisterna chyli near the lower border of the twelth thoracic veebra and enters the thorax through the aoic opening of the diaphragm. <img src=" /> REF.B D Chaurasia's human anatomy vol.1,fifth edition.pg 270