Hemiazygos vein

Hemiazygos vein

Infobox Vein
Name = PAGENAME
Latin = vena hemiazygos
GraySubject = 172
GrayPage = 667


Caption = Diagram showing completion of development of the parietal veins. (Hemiazygos vein visible at center-left.)


Caption2 = The venæ cavæ and azygos veins, with their tributaries.
DrainsFrom =
DrainsTo = azygos vein
Artery =
MeshName =
MeshNumber =
DorlandsPre = v_05
DorlandsSuf = 12850474
The hemiazygos vein (vena azygos minor inferior) is a vein running superiorly in the lower thoracic region, just to the left side of the vertebral column.

tructure

The hemiazygos vein and the accessory hemiazygos vein, when taken together, essentially serve as the left-sided equivalent of the azygos vein. That is, the azygos vein serves to drain most of the posterior intercostal veins on the right side of the body, and the hemiazygos vein and the accessory hemiazygos vein drain most of the posterior intercostal veins on the left side of the body. Specifically, the hemiazygos vein mirrors the bottom part of the azygos vein.

The structure of the hemiazygos vein is often variable. It usually begins in the left ascending lumbar vein or renal vein, and passes upward through the left crus of the diaphragm to enter the thorax. It continues ascending on the left side of the vertebral column, and around the level of the ninth thoracic vertebra, it passes rightward across the column, behind the aorta, esophagus, and thoracic duct, to end in the azygos vein.

The hemiazygos may or may not be continuous superiorly with the accessory hemiazygos vein.

It receives the 9th, 10th, and 11th posterior intercostal veins and the subcostal vein of the left side, and some esophageal and mediastinal veins.

Etymology

The name for this vein is derived from that of the azygos vein. "Azygos" means 'unpaired', and "hemi" means half. This vein mirrors the bottom half the azygos vein.

External links

* (NormanAnatomyFig|postmediastinumlevel5)
* - "Mediastinum: The Azygos Vein and Posterior Intercostal Veins"
*


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Look at other dictionaries:

  • hemiazygos vein — hemi·a·zy·gos vein ( )ā zī gəs , az ə gəs n a vein that receives blood from the lower half of the left thoracic wall and the left abdominal wall, ascends along the left side of the spinal column, and empties into the azygos vein near the middle… …   Medical dictionary

  • hemiazygos vein accessory — vena hemiazygos accessoria …   Medical dictionary

  • Accessory hemiazygos vein — Infobox Vein Name = PAGENAME Latin = vena hemiazygos accessoria GraySubject = 172 GrayPage = 664 Caption = Diagram showing completion of development of the parietal veins. (Accessory hemiazygos vein visible at center left.) Caption2 = The venæ… …   Wikipedia

  • accessory hemiazygos vein — n a vein that drains the upper left side of the thoracic wall, descends along the left side of the spinal column, and empties into the azygos or hemiazygos veins near the middle of the thorax …   Medical dictionary

  • accessory hemiazygos vein — noun a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein • Syn: ↑accessory hemiazygous vein, ↑vena hemiazygos accessoria • Hypernyms: ↑vein, ↑vena, ↑venous blood vessel …   Useful english dictionary

  • Vein — A blood vessel that carries blood low in oxygen content from the body back to the heart. The deoxygenated form of hemoglobin (deoxyhemoglobin) in venous blood makes it appear dark. Veins are part of the afferent wing of the circulatory system… …   Medical dictionary

  • Azygos vein — Infobox Vein Name = PAGENAME Latin = vena azygos GraySubject = 172 GrayPage = 667 Caption = Superior vena cava, inferior vena cava, azygos vein and their tributaries. (Vena azygos labeled at center.) Caption2 = POSTERIOR VIEW: The position and… …   Wikipedia

  • Ascending lumbar vein — Infobox Vein Name = PAGENAME Latin = vena lumbalis ascendens GraySubject = 172 GrayPage = 667 Caption = The venæ cavæ and azygos veins, with their tributaries. DrainsFrom = lateral sacral veins DrainsTo = azygos vein, hemiazygos vein Artery =… …   Wikipedia

  • vena hemiazygos accessoria — [TA] accessory hemiazygos vein: the descending intercepting trunk for the upper, often the fourth through the eighth, left posterior intercostal veins. It lies on the left side and at the eighth thoracic vertebra joins the hemiazygos vein or… …   Medical dictionary

  • azygos vein — n any of a system of three veins which drain the thoracic wall and much of the abdominal wall and which form a collateral circulation when either the inferior or superior vena cava is obstructed esp a vein that receives blood from the right half… …   Medical dictionary

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