"The Thebesian valve is named after the Silesian physician Adam Christian Thebesius (1686-1732) 6, who described the valve in his anatomy dissertation ‘Disputatio medica inauguralis de circulo sanguinis in corde’ when he graduated from Leiden University in 1708 5."
"The Thebesian valve was found to present in about 70% in autopsies 1 and could be visualised in imaging studies in a range of 40-70% of cases 2,3 and covers the coronary sinus ostium in variable types and extents of which the whole coverage of coronary sinus ostium by the semilunar membrane is the most common. Other types of Thebesian valves show incomplete coverage arising either from the anteroposterior wall or the interatrial septum or both with a gap in between 1-3."