The large vein that returns blood from the head, neck, thorax, and upper limbs to the right atrium of the heart is the:

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The superior vena cava is a large vein that returns deoxygenated blood from the head, neck, thorax, and upper limbs to the right atrium of the heart. The aorta is the largest artery in the body and carries oxygenated blood away from the heart to the rest of the body. The inferior vena cava returns blood from the lower part of the body to the right atrium of the heart. The carotid artery supplies blood to the head and neck.

The Large Vein That Returns Blood from the Head, Neck