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azygos vein


Definition: vein arising from the merger of the right ascending lumbar vein with the right subcostal vein and often a communication with the superior vena cava; ascends through the aortic hiatus of the diaphragm or its right crus; it runs along the right side of the thoracic vertebral bodies in the posterior mediastinum, and terminates by arching anteriorly over the root of the right lung to enter the posterior aspect of the superior vena cava.

Synonym(s): vena azygosTA, azygos2, vena azygos major

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.