Coronary sinus

Coronary sinus
Vein: Coronary sinus
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Base and diaphragmatic surface of heart.
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Interior of right side of heart.
Latin sinus coronarius
Gray's subject #138 530
Source great cardiac vein
Drains to right atrium
Precursor sinus venosus

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 all mammals, including humans. It delivers deoxygenated blood to the Right atrium in conjunction with the superior and inferior vena cava.

The coronary sinus opens into the right atrium, between the inferior vena cava and the atrio-ventricular orifice. 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 (the 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.(Gray 462)

Contents

Location

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.

Drainage

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.

See also

  • Coronary arteries

Additional images

External links


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Look at other dictionaries:

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  • coronary sinus — noun a short sinus receiving most of the veins of the heart; empties into the right atrium • Syn: ↑sinus coronarius • Hypernyms: ↑venous sinus, ↑sinus …   Useful english dictionary

  • coronary sinus — Anat. a large venous channel in the heart wall that receives blood via the coronary veins and empties into the right atrium. [1825 35] * * * …   Universalium

  • coronary sinus — cor′onary si′nus n. anat. a large venous channel in the heart wall that receives blood via the coronary veins and empties into the right atrium …   From formal English to slang

  • coronary sinus — noun Date: 1831 a venous channel that is derived from the sinus venosus, is continuous with the largest of the cardiac veins, receives most of the blood from the walls of the heart, and empties into the right atrium …   New Collegiate Dictionary

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  • unroofed coronary sinus — congenital complete or partial absence of the partition dividing the coronary sinus from the left atrium, allowing the shunting of blood from the left atrium through the coronary sinus into the right atrium …   Medical dictionary

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