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azygos

   Also found in: Dictionary/thesaurus, Legal, Encyclopedia, Wikipedia 0.01 sec.
azygos /az·y·gos/ (az´ĭ-gus)
1. unpaired.
2. any unpaired part, as the azygos vein.

az·y·gos (z-gs, -zgs)
n.
An unpaired anatomical structure.
adj. or a·zy·gous (-zgs)
Not one of a pair, as a vein or muscle; occurring singly.

azygos.
See azygous.

azygos [az´ĭ-gos]
any unpaired part, as the azygos vein.
azygos vein a vein beginning in the abdomen as a continuation of the ascending lumbar vein; it and its tributaries serve as vessels for the return of blood from the thorax to the superior vena cava. The azygos vein also serves as a connecting link, through the ascending lumbar vein, between the venae cavae returning blood from above and below the heart. See anatomic Table of Veins in the Appendices.

azygos
1. any unpaired part, as the azygos vein.
2. unpaired. Called also azygous.

azygos vein
a vein beginning in the abdomen and coursing in the dorsal mediastinum which returns blood from the thorax to the heart. The right azygos is found in most domestic animals (rarely the pig) while the left azygos is found in pigs and ruminants.


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Intravenous reflux into the azygos vein and the inferior vena cava to the level of the hepatic venous system (Figure 2) was seen.
1,2) From the cisterna chyli, it ascends into the chest through the aortic hiatus, along the right side of the aorta, and continues posterior to the esophagus in the posterior mediastinum between the aorta and the azygos vein.
An enlarged azygos system (azygos and hemiazygos diameters together equal greater than 10 mm) (2) associated with a posterobasal chest lesion may suggest the diagnosis.
 
 
 
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