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First Anterior Intercostal Vein (Left)
Cardiovascular System

First Anterior Intercostal Vein (Left)

Vena intercostalis anterior prima

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The anterior intercostal veins are small venae comitantes of the anterior intercostal branches of the internal thoracic artery.


The anterior intercostal veins course through their corresponding intercostal spaces. They drain the blood anteriorly, where the most superior veins drain into the internal thoracic vein and inferior veins drain into the musculophrenic vein.


There are no named tributaries; however, they do form an anastomosis with the posterior intercostal veins.

Structures Drained

The anterior intercostal veins drain the muscles of the intercostal space, the sternum, and overlying skin.

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A venous sinus is a vein with a thin wall of endothelium that is devoid of smooth muscle to regulate its diameter.

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