Spelling it hemiazygous when referring to the vein is incorrect, regardless of whether british or american english 7. The azygos vein is a vein running up the right side of the thoracic vertebral column. The azygos venous system represents an accessory venous pathway supplying an important collateral circulation between the superior and inferior vena cava. Hemiazygous veincoronary sinus structure in the fetal pig, the hemiazygous vein drains directly into the coronary sinus of the heart. The hemiazygos vein created on the left, quite similar to the azygos vein, by the union of left ascending lumbar vein and left subcostal vein. Information and translations of hemiazygos vein in the most comprehensive dictionary definitions resource on the web. Accessory hemiazygos vein noun the noun accessory hemiazygos vein has 1 sense. Accessory hemiazygos vein medical definition merriam.
This article will discuss the anatomical course, relations and variations of the azygos vein as well as its tributaries. Its counterparts on the left side are the hemiazygos and accessory hemiazygos veins. It receives tributaries from veins in the 4 th to 8 th intercostal spaces and sometimes from the left bronchial veins. April 09, 2020 the azygos venous system is located on either side of the vertebral column and drains the viscera within the mediastinum, as well as the back and thoracoabdominal walls. The hemiazygos vein is the asymmetric counterpart to the azygos vein and forms part of the azygos venous system. Accessory hemiazygos vein used as a noun is very rare. Slightly higher, at the sixth or seventh thoracic vertebra, it receives the accessory hemiazygos vein as a single trunk in 72% of individuals. Hemiazygos vein definition of hemiazygos vein by the free. Nov 01, 2015 in the thorax, the hemiazygos vein crosses posterior to the aorta at approximately t8 or t9 to join the azygos vein. The accessory hemiazygos vein, also called the superior hemiazygos vein, drains the superior left hemithorax. In addition, the posterior 4th, 5th, 6th and 7th intercostal veins united and formed two. This vein develops in the thorax at the level of t12 thoracic vertebra. The accessory hemiazygos vein, also called the superior hemiazygous vein is a vein on the left side of the vertebral column that generally drains the fourth through eighth intercostal spaces on the left side of the body.
The rhythmic beating of the heart is a ceaseless activity, lasting from. The hemiazygos vein and the accessory hemiazygos vein, when taken together, essentially serve as the leftsided equivalent of the azygos vein. Venous congenital anomalies can be categorized into systemic venous system including svc and the azygos system and pulmonary venous system 2, 4, 5. In the thorax the hemiazygos vein crossed to the right, joining the azygos vein figure 5, before finally running into the superior vena cava. If you would like a large, unwatermarked image for your web page or. All these structures constitute the azygos system fig. It drains into the superior vena cava, and transports deoxygenated blood from the posterior walls of the thorax and the abdomen. Jan 20, 2015 the best sleeping position for back pain, neck pain, and sciatica tips from a physical therapist duration. Scroll down to view images of normal anatomical variants. Hemiazygos vein medical definition merriamwebster medical. Judes medical 800722 3423 biotronik 800547 0394 intermedics guidantboston scientific 800231 2330.
Transposition and variant termination of azygos and hemiazygos. The best sleeping position for back pain, neck pain, and sciatica tips from a physical therapist duration. On the left side of the thorax, posterior intercostal veins between the 8th and 11th intercostal spaces and the subcostal vein drained into the azygos vein independently. The accessory hemiazygos vein, also called the superior hemiazygos vein, drains into the superior left hemithorax. Consequently, the coronary sinus is relatively very large. The aim of this article is to revise the wide spectrum of changes ranging from normal to pathological conditions involving the azygos system. Other articles where hemiazygous vein is discussed. It normally anastomoses with the left superior intercostal vein. Click on an image to see a full larger version with arrows. The anatomy of this blood vessel can be quite variable. The azygos system of veins is considered to be, the azygos vein, along with its leftsided counterparts, the hemiazygos vein and the accessory hemiazygos vein. Hemiazygos vein article about hemiazygos vein by the free. In some rare variations for example, it also drains thoracic. The accessory hemiazygos vein this vein begins at the medial end of the 4 th or 5 th intercostal space and descends on the left side of the vertebral column from t5 to t8.
Superior hemiazygos vein vena hemiazygos accessoria anatomical parts. Multiple variations of the azygos venous system were detected during routine dissection. Hemiazygos definition of hemiazygos by medical dictionary. The reason for this difference is explained in the section. Radiological appearances of renal vascular anatomical variants. The hemiazygos vein bifurcated on the left side of the 10th thoracic vertebra and the two ends opened into the azygos vein at the level of 9th and. Accessory hemiazygos vein also ka sup hemiazygos vein contn of 4th post ic v of lt side runs down on lt side of vert column at t7 level turns rt ends in azygos v may join hemiazygos v tributaries. Prenatal diagnosis of a variant of the azygos venous system. At the level of the diaphragm, the right ascending lumbar vein continues upward as the azygous vein, principal tributaries of which are the right intercostal veins, which drain the muscles of the intercostal. This variable vein typically begins at the level of the fourth intercostal space and descends to the level of the eighth thoracic vertebra. Hemiazygos vein definition of hemiazygos vein by medical.
In fact, you could say that it becomes the coronary sinus. Along its course, the azygos vein communicates with the intercostal veins on the right, the hemiazygos vein that collects blood from the left lower. 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. Vena azygos accessoria, accessory hemiazygos vein, superior hemiazygos vein, vena hemiazygos accessoria, veine hemiazygos accessoire description the accessory hemiazygos vein is located in the posterior mediastinum, to the left side of the bodies of the fifth, sixth, and seventh thoracic vertebrae. The hemiazygos vein crosses from left to right at approximately the level of t9 and terminates by emptying into the azygos vein. The accessory hemiazygos vein varies inversely in size with the left superior intercostal vein. You may not embed one of our images on your web page without a link back to our site. Information and translations of vena hemiazygos accessoria in the most comprehensive dictionary definitions resource on the web. Distended azygos and hemiazygos vein without interrupted. Teaching points the azygos vein is a collateral venous pathway, becoming a vital shunt if major. The azygos vein system can be configured differently for different. Learning radiology central, venous, catheter, azygos, vein. It originates from lateral, medial and intermediate roots or from the combination of any three.
We report a rare variation of azygos vein as seen in an adult male cadaver. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Accessory hemiazygos vein definition at, a free online dictionary with pronunciation, synonyms and translation. The accessory hemiazygos vein, also called the superior hemiazygous veinis a vein on the left. Apr 23, 2015 its tributaries, apart from its main tributary, the hemiazygos vein are the bronchial veins, pericardial veins, and posterior right intercostal veins. The azygos system of veins is considered to be, the azygos vein, along with its leftsided counterparts, the hemiazygos vein. Aug 30, 2014 the azygos venous system represents an accessory venous pathway supplying an important collateral circulation between the superior and inferior vena cava. Hemiazygos and accessory azygos veins may communicate witheach otherazygos vein. It occasionally receives the left superior intercostal vein, which drains the upper two to three intercostal spaces. Posterior to this connection a collateral venous vessel originated from the ivc, joining the dilated hemiazygos vein on the left side of the abdominal aorta.
The lumbar vein then ascended upwards in the thorax and joined with the left subcostal vein to continue further up as the accessory hemiazygos vein figure 3. In the thorax, the hemiazygos vein crosses posterior to the aorta at approximately t8 or t9 to join the azygos vein. Teaching points the azygos vein is a collateral venous pathway, becoming a vital shunt if. The azygos vein transports deoxygenated blood from the posterior walls of the thorax and abdomen into the superior vena cava vein. The accessory hemiazygos vein connects the middle three or four intercostal veins. Its tributaries, apart from its main tributary, the hemiazygos vein are the bronchial veins, pericardial veins, and posterior right intercostal veins. At the level of the eighth thoracic vertebra, the hemiazygos vein bends to the right, runs behind the aorta, and empties into the azygos vein.
Pdf multiple variations in the azygos venous system. The accessory hemiazygos vein sits on the left anterior side of thoracic vertebral bodies. It is located on the right side of the thoracic vertebral column. In the context of anatomy, see terminologia anatomica, hemiazygos vein is the sole correct spelling. This double variant must be identified preoperatively as perioperative death following inadvertent ligation of hemiazygostoazygos continuation of a left ivc during thoracic surgery has been reported 5. Tributaries to the hemiazygos vein include the left bronchial, left lower intercostal, left subcostal, and left ascending lumbar veins. Accessory hemiazygos vein the azygos vein runs in the posterior mediastinum, on the right side of thoracic vertebral column.
1327 1358 1563 1614 548 514 212 287 1339 1103 1167 1088 978 374 149 904 767 1084 1139 956 940 846 240 1463 955 87 295 925 1250 814 1255 1053 1356 1067 83 657 1001 1173