In the anatomy of the heart, the valve of the coronary sinus (also called the Thebesian valve, after Adam Christian Thebesius[1][2][3]) is a valve located at the orifice of the coronary sinus where the coronary sinus drains into the right atrium.[4] It prevents blood from flowing backwards into the coronary sinus during contraction of the heart.
Valve of the coronary sinus | |
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Details | |
Identifiers | |
Latin | valvula sinus coronarii |
TA98 | A12.1.01.016 |
TA2 | 4030 |
FMA | 9242 |
Anatomical terminology [edit on Wikidata] |
The valve of the coronary sinus is a thin, semilunar (half-moon-shaped) valve located on the anteroinferior part of the opening into the right atrium.[5] It is formed by as semicircular fold of the lining membrane of the right atrium. It is situated at the base of the inferior vena cava.[citation needed]
The valve may be completely absent;[6] it is present in 73-86% of individuals.[7]
The valve may vary in size.[6] It may be double, or it may be cribriform (containing numerous small holes).[citation needed]
The valve prevents regurgitation of blood into the sinus during diastole (i.e. the contraction of the atrium).[4]
This article incorporates text in the public domain from page 531 of the 20th edition of Gray's Anatomy (1918)