Question

Choose all the veins that are part of the azygous system

select all that apply: A. Ascending lumbar vein B. Inferior phrenic vein C. Posterior intercostal veins D. Mediastinal veins E. Accessory hemiazygous vein.

Answer 1

The veins that are part of the azygous system include the ascending lumbar vein, inferior phrenic vein, posterior intercostal veins, mediastinal veins, and accessory hemiazygous vein.

Step-by-step explanation:

The veins that are part of the azygous system include:

• Ascending lumbar vein: These veins drain the lumbar portion of the abdominal wall and spinal cord, and they drain into the azygos vein on the right or the hemiazygos vein on the left.
• Inferior phrenic vein: These veins also drain into the azygos vein.
• Posterior intercostal veins: These veins drain the muscles of the thoracic wall and flow into the azygos vein.
• Mediastinal veins: These veins drain the mediastinal region and flow into the azygos vein.
• Accessory hemiazygous vein: This vein is a smaller vein that drains the left intercostal veins and leads to the brachiocephalic vein via the superior intercostal vein.

These veins play a role in draining blood from the abdominal and thoracic regions and returning it to the superior or inferior vena cava.