*The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart.
*It is present in humans and other animals.
*The coronary sinus opens into the auricle, between the inferior vena cava and the auriculo-ventricular opening.
*It returns the blood from the substance of the heart, and is protected by a semicircular fold of the lining membrane of the auricle, the coronary valve. ( valve of Thebesius).
*The sinus, before entering the auricle, is considerably dilated - nearly to the size of the end of the little finger.
*Its wall is partly muscular, and at its junction with the great coronary vein is somewhat constricted and furnished with a valve consisting of two unequal segments.
*It is located in the right atrium and runs transversely in the groove between the left atrium and ventricle on the posterior surface of the heart.
*The coronary sinus orifice (opening) is just superior to the septal leaflet of the tricuspid valve.
*The coronary sinus orifice is also known as the ostium of the coronary sinus, and is guarded by the Thebesian valve.
*It receives blood mainly from the small, middle, great and oblique cardiac veins.
*It also receives blood from the left marginal vein and the left posterior ventricular vein.
*The anterior cardiac veins drain directly into the right atrium. (Some small veins drain into any of the four chambers of the heart.)
*It drains into the right atrium on the posterior, inferior surface, medial to the inferior vena cava opening.
No comments:
Post a Comment