Accessory hemiazygos vein

Accessory Hemiazygos Vein

The accessory hemiazygos vein and its tributaries.

The Accessory Hemiazygos Vein is a significant vein located in the human thoracic region. It is a variation of the Hemiazygos Vein and plays a crucial role in the venous drainage system of the thoracic and abdominal regions.

Anatomy

The accessory hemiazygos vein typically begins in the left superior intercostal vein and descends on the left side of the vertebral column, draining the 4th to 8th left posterior intercostal veins. It crosses the midline to drain into the Azygos Vein.

Function

The primary function of the accessory hemiazygos vein is to drain blood from the posterior walls of the thorax and abdomen. It serves as a significant pathway for the return of blood from the body's lower half to the heart.

Clinical Significance

Anomalies in the accessory hemiazygos vein can lead to various clinical conditions. For instance, it can be involved in Azygos Continuation, a rare congenital anomaly where the inferior vena cava is absent, and the azygos system takes over its function.

See Also

• Azygos Vein
• Hemiazygos Vein
• Venous System

References

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