NEET PG Medical – 2015 – Question – 45
Tributary of coronary sinus ?
a) Anterior cardiac vein
b) Thebesion vein
c) Smallest cardiac vein
d) Great cardiac vein
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Correct Answer – D
Ans. (D) Great cardiac vein
Coronary sinus
- It opens in the posterior wall of right atrium, in the posterior part of coronary sulcus.
- It opens in the right atrium between IVC and tricuspid orifices.
- Coronary sinus is guarded by Thebesian valve (Thebesian valve (incomplete semilunar valve) guards the orifice of coronary sinus.)
Tributaries of coronary sinus are : - Great cardiac vein :- Lies in the anterior interventricular groove. Left marginal vein drains into it.
- Middle cardiac vein :- Lies in the posterior interventricular groove.
- Posterior vein of left ventricle.
- Small cardiac vein :- It lies in the posterior part of coronary sulcus with RCA. Right marginal vein may sometimes open into small cardiac vein, more often, however, right marginal vein opens directly into right atrium.
- Oblique vein of left atrium (vein of marshal) :- It is continuous above with ligament of IVC. These two structures are embryological remnants of left common cardinal vein (duct of Cuvier).
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