WordNet

make a veinlike pattern
any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ (同)nervure
one of the horny ribs that stiffen and support the wing of an insect (同)nervure
a layer of ore between layers of rock (同)mineral vein
a blood vessel that carries blood from the capillaries toward the heart; "all veins except the pulmonary vein carry unaerated blood" (同)vena, venous blood vessel
a distinctive style or manner; "he continued in this vein for several minutes"
having or showing markings that resemble veins (同)venose, veinlike
occurring singly; not one of a pair; "the azygous muscle of the uvula" (同)azygos

PrepTutorEJDIC

〈C〉『静脈』 / 〈C〉(植物の)葉脈;(昆虫の)翅脈;(石の)石理;(木の)木目 / 〈C〉岩脈,鉱脈 / 〈U〉《しばしば a vein》(…の)傾向,性質《+of+名》 / 〈U〉《the vein》(…に対する)気分,気持ち《+for+名(doing)》
しも(筋)のある,筋のついた
(葉・昆虫の羽などの)脈模様,すじ

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/02 01:36:55」(JST)

wiki en

The azygos vein is a vein running up the right side of the thoracic vertebral column. It can also provide an alternative path for blood to the right atrium by allowing the blood to flow between the venae cavae when one vena cava is blocked.

Structure

The azygos vein transports deoxygenated blood from the posterior walls of the thorax and abdomen into the superior vena cava vein. The anatomy of this blood vessel can be quite variable. In some rare variations for example, it also drains thoracic veins, bronchial veins and even gonadal veins. The vein is so named because it has no symmetrically equivalent vein on the left side of the body.

It is formed by the union of the ascending lumbar veins with the right subcostal veins at the level of the 12th thoracic vertebra, ascending in the posterior mediastinum, and arching over the right main bronchus posteriorly at the root of the right lung to join the superior vena cava. This "arch of the azygos vein" (arcus venae azygos) is an important anatomic landmark. As an anatomical variation in 1-2% of the population, the arch can be displaced laterally, thereby creating a pleural septum separating an azygos lobe from the upper lobe of the right lung.

A major tributary is the hemiazygos vein, a similar structure on the opposite side of the vertebral column. Other tributaries include the bronchial veins, pericardial veins, and posterior right intercostal veins. It communicates with the vertebral venous plexuses.

Azygos venous system

The azygos system of veins is considered to be the azygos vein, along with its left-sided counterparts, the hemiazygos vein and the accessory hemiazygos vein.

Etymology

The Greek root zyg refers to a pair. 'A-' means not. Thus, azygos means unpaired. The azygos vein is unpaired in that there is only one in the body, mostly on the right side. While there is the hemiazygos vein and its accessory on the left side of the body, they are considered tributaries of the azygos vein rather than its left-side equivalent.

This terminology is only accurate in some species, such as the human, dog and cat. Ruminants (such as sheep and cows) have paired azygos veins

Additional images

Diagram showing completion of development of the parietal veins.
Transverse section of thorax at about CC3, showing relations of pulmonary artery.
Base and diaphragmatic surface of heart.
The venæ cavæ and azygos veins, with their tributaries.
The thoracic and right lymphatic ducts.
Mediastinal surface of right lung.
Azygos vein
Azygos vein

References

^ Edward Lamperti; Michael Schuenke; Erik Schulte; Udo Schumacher; Ross, Lawrence J. (2006). General Anatomy and Musculoskeletal System (Thieme Atlas of Anatomy). Thieme Publishing Group. p. 13. ISBN 3-13-142081-2.

External links

Anatomy figure: 19:03-03 at Human Anatomy Online, SUNY Downstate Medical Center - "Right side of the mediastinum."
Dissection at lumc.edu
Radiology at umich.edu

UpToDate Contents

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「vena azygos」

Vein: Azygos vein
	Superior vena cava, inferior vena cava, azygos vein and their tributaries. (Vena azygos labeled at center.)
	POSTERIOR VIEW: The position and relation of the esophagus in the cervical region and in the posterior mediastinum. Seen from behind. (Azygos vein labeled at bottom left.)
Latin	vena azygos
Gray's	p.667
Source	superior intercostal vein
Drains to	superior vena cava
Precursor	Right supracardinal vein
MeSH	Azygos+Vein