1. Receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins
   - superior vena cava

Type of: vena cava

• genus Armoracia
• genus Arnica
• genus Arnoseris
• genus Arrhenatherum
• genus Artamus
• genus Artemia
• genus Artemisia
• genus Arthropteris
• genus Artocarpus
• genus Arum
• genus Arundinaria
• genus Arundo
• genus Arvicola
• genus Asarum
• genus Ascaphus
• genus Ascaridia
• genus Ascaris
• genus Asclepias
• genus Ascophyllum
• genus Asimina
• genus Asio
• genus Aspalathus
• genus Asparagus
• genus Aspergillus
• genus Asperula