Venous Drainage of the Heart

The blood supplying the tissues of the heart is drained through two main sources:

1. Coronary sinus and the branches draining to it 
2. Right atrium directly

Coronary sinus

The main, wide vein that runs from left to right in the posterior part of the coronary sulcus.

There are few veins which drain into the coronary sinus:

1. Small cardiac veins at its right end
2. Middle cardiac vein
3. The left posterior ventricular vein and left marginal vein
4. Oblique vein (of Marshall)
5. Great cardiac vein at its left

Coronary sinus

Small cardiac veins

Middle cardiac vein

Great cardiac vein

The oblique vein (of Marshall)

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