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The·be·sian vein

n :  any of the minute veins of the heart wall that drain directly into the cavity of the heart - called also Thebesian vessel 
 
The•be•si•us, Adam Christian (1686-1732),
German anatomist. Thebesius was the first to examine the details of the circulation of the blood in the heart. He described the valve at the orifice of the coronary sinus, now known as the coronary valve or the valve of Thebesius, and the small veins by which the blood passes from the walls of the heart to the right atrium.
 
 

 
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