To discuss:
The azygos system of thoracic veins, especially the azygos, hemiazygos, and accessory hemiazygoes veins; their tributaries, including the posterior intercostal, subcostal, esophageal, mediastinal, pericardial, bronchial, and ascending lumbar veins.
Introduction:
The veins are afferent vessels of the cardiovascular system. They carry de-oxygenated blood from the organs to the heart. They are also called as capacitance vessels, as they have a flaccid and thin wall. When compared with arteries, they accommodate 64% more volume of blood. The veins have low blood pressure than arteries and have a steady blood flow.
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