Which vein drains blood from the left side of the thorax and esophagus into the left brachiocephalic vein?

A) Hemiazygos vein
B) Left azygos vein
C) Internal thoracic vein
D) Accessory hemiazygos vein

Hemiazygos Vein

A vein on the left side of the vertebral column that drains blood from the posterior walls of the thorax and abdomen into the superior vena cava.

Brachiocephalic Vein

A large vein formed by the union of the internal jugular and subclavian veins, draining blood from the head, neck, upper limbs, and upper chest.

Thorax

The part of the body between the neck and the abdomen, enclosed by the ribs and containing the heart and lungs.