[TA] several fossae in the wall of the right atrium, containing the openings of minute intramural veins. SYN: foramina venarum minimarum atrium dextrum cordis [TA], foramina of the smallest veins of heart, foramina of the venae minimae, Lannelongue foramina, thebesian foramina, Vieussens foramina.