Coronary sinus

Vein: Coronary sinus
Base and diaphragmatic surface of heart.
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
Dorlands / Elsevier	s_12/12738662

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

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.

Location

It is located between the left atrium and ventricle on the posterior surface of the heart.

It 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.

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.

Additional images

• 

  Diagram showing completion of development of the parietal veins.

• SUNY Figs 20:04-03 - "Posterior view of the heart."
• MedEd at Loyola Radio/curriculum/Vascular/Coronary_sinus.jpg

Pathophysiology

The coronary sinus can be the site of drainage of an atrial septal defect (see coronary sinus atrial septal defect).

See also

• Coronary arteries

nn:Koronarsinus