Subclavian lymph trunk
The efferent vessels of the subclavicular group unite to form the subclavian trunk, which opens either directly into the junction of the internal jugular and subclavian veins or into the jugular lymphatic trunk; on the left side it may end in the thoracic duct.
References
This article incorporates text in the public domain from page 700 of the 20th edition of Gray's Anatomy (1918)