True about coronary sinus

The coronary sinus is the largest vein of the hea. It is situated in the L. posterior coronary sulcus. Opens into the posterior wall of R. Atrium Tributaries: Great cardiac veins Middle cardiac vein Small cardiac vein Posterior vein of L. ventricle Oblique vein of L. atrium of marshal. R. marginal vein. It develops from the Left sinus venosus. venae cordis minimi or thebesian veins are small veins that open into the hea chambers directly.