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Definition of Superior vena cava

Superior vena cava: A large vein that receives blood from the head, neck, upper extremities, and thorax and delivers it to the right atrium of the heart.

Atrial Fibrillation Illustration

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=10781
Last Editorial Review: 6/14/2012

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