Thebesian ring

Valve of the coronary sinus
Interior of right side of heart. (Valve of the coronary sinus labeled at bottom left.)
Details
Identifiers
Latin	valvula sinus coronarii
Dorlands /Elsevier	v_02/12844606
TA	A12.1.01.016
FMA	9242
Anatomical terminology []

The valve of the coronary sinus (Thebesian Ring) is a semicircular fold of the lining membrane of the right atrium, at the orifice of the coronary sinus. It is situated at the base of the inferior vena cava.

The valve may vary in size, or be completely absent.

It may prevent the regurgitation of blood into the sinus during the contraction of the atrium.

This valve may be double or it may be .

It is named for German anatomist Adam Christian Thebesius.

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)