Venous drainage from the posterior thoracic wall enters the superior vena cava via the ________ vein.

A) subclavian
B) internal thoracic
C) accessory hemiazygos
D) hemiazygos
E) azygos

Venous Drainage

The process by which blood is returned to the heart through veins after oxygen and nutrients have been delivered to tissues.

Superior Vena Cava

The superior vena cava is a large vein that carries deoxygenated blood from the upper half of the body to the heart.

Hemiazygos

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