Lumbar trunk

Lumbar trunk is the anatomical term from Terminologia Anatomica 1 that groups the righd and left lumbar trunks.

The right and left lumbar lymphatic trunks drain the lymph from the lower extremities, pelvic organs, and parts of the abdominal wall. The lumbar lymphatic trunks originate from the confluence of several lumbar lymphatic vessels that collect lymph from the lumbar lymph nodes and ascends along the right or left side of the abdominal aorta.

They join the intestinal trunk to form the cisterna chyli, which is the dilated sac that serves as a reservoir for lymph before it enters the thoracic duct.

The confluence patterns of the lumbar trunks and the intestinal trunk can vary, with the right lumbar trunk sometimes joining the common trunk formed by the left lumbar and intestinal trunks, or vice versa.[1]