NEET PG Medical – 2016 – Question – 63
Thoracic duct opens into systemic circulation at?
a) junction of SVC and left brachiocephalic vein
b) Junction of left internal jugular and left subclavian vein
c) Directly into coronary sinus
d) Into azygous vein
Correct Answer – B
Ans. B. Junction of left internal jugular and left subclavian vein
Thoracic duct begins as a continuation of the upper end of the cisterna chyli linear the lower border of T12 vertebra and enters the thorax through the aortic opening of diaphragm (at T12). It then ascends through the posterior mediastinum and at T5 level crosses from right side to the left side and ascends along left margin of esophagus to enter the neck. At the level of C7 vertebrae, arches towards left side to open into left brachiocephalic vein at the angle of union of left subclavian and left internal jugular veins.
