- Hemiazygos vein
Name = PAGENAME
Latin = vena hemiazygos
GraySubject = 172
GrayPage = 667
Caption = Diagram showing completion of development of the
parietalveins. (Hemiazygos vein visible at center-left.)
Caption2 = The
venæ cavæand azygos veins, with their tributaries.
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
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 veinson 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 veinor renal vein, and passes upward through the left crusof 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 veinsand the subcostal veinof the left side, and some esophageal and mediastinal veins.
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.
* - "Mediastinum: The Azygos Vein and Posterior Intercostal Veins"
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См. также в других словарях:
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