Which two vessels drain into the superior vena cava (SVC)?

The superior vena cava (SVC) serves as a major vein that collects deoxygenated blood from the upper body and returns it to the heart. The two primary vessels that drain directly into the SVC are the right and left innominate veins (also known as the brachiocephalic veins). Each of these innominate veins is formed by the union of the corresponding internal jugular vein and subclavian vein, collecting blood from the head, neck, and upper limbs before feeding it into the SVC.

The role of the innominate veins is essential as they represent the confluence of important venous structures from both sides of the body, facilitating efficient blood flow towards the heart. Understanding this anatomical relationship is crucial in vascular technology, particularly in procedures and imaging that involve central venous access or assessing central venous return.

The other options do not accurately represent the vessels that drain into the SVC. For instance, while the carotid arteries are vital for supplying blood to the head, they do not drain blood into the SVC. Similarly, the subclavian and axillary veins are important but, they are tributaries to the innominate veins rather than draining directly into the SVC. Finally, the fem