<prompt> The thoracic duct receives tributaries from all of the following except?Bilateral ascending lumbar trunkBilateral descending thoracic trunkLeft upper intercostal ductRight bronchomediastinal lymphatic trunk  <response>: Right bronchomediastinal lymphatic trunk.The thoracic duct is the largest lymphatic vessel in the body.It begins in the abdomen as a dilated sac, the cisterna chyli ends at the root of neck,draining into the beginning of left brachiocephalic vein.It is about 45 cm long has a beaded appearance because of presence of many valves in its lumenTributaries The thoracic duct receives lymph from roughly both halves of the body below the diaphragm the left half above the diaphragm.In the thorax:Bilateral descending thoracic lymph trunks from intercostal lymph nodes of the lower six or seven intercostal spaces of both sidesBilateral ascending lumbar lymph trunks from the upper lateral aoic nodesUpper intercostal trunks draining the intercostal nodes in the upper five or six left intercostal spaces.Mediastinal trunks draining various nodal groups.At the root of neck:Left jugular trunkLeft subclan trunkLeft bronchomediastinal lymph trunkThe right jugular, subclan bronchomediastinal trunks, which drain the right side of the head neck, the right upper limb, and the right side of the thorax respectively may join to form the right lymphatic duct which opens into the beginning of the right brachiocephalic vein. 