Smallest cardiac veins

Smallest Cardiac Veins

The Smallest Cardiac Veins or Thebesian veins are minute vessels that drain directly into the chambers of the heart, bypassing the coronary veins and coronary sinus. They are named after the German anatomist Adam Christian Thebesius who discovered them.

Anatomy

The smallest cardiac veins are found in all four chambers of the heart, but are most abundant in the right atrium and least abundant in the left ventricle. They are also found in the atrioventricular valves and semilunar valves. These veins are valveless and drain directly into the heart chambers.

Physiology

The smallest cardiac veins play a role in the coronary circulation, which is the circulation of blood in the blood vessels of the heart muscle. They provide an alternative route for blood to return to the heart, bypassing the coronary veins and coronary sinus. This is particularly important in conditions where the coronary sinus is blocked or narrowed.

Clinical significance

The smallest cardiac veins can be a source of ventricular arrhythmias. They can also be a source of paradoxical embolism, where a blood clot or other embolus reaches the arterial system through a right-to-left shunt, bypassing the lungs.

See also

• Coronary circulation
• Coronary sinus
• Coronary veins
• Heart
• Ventricular arrhythmias

References

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