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The hemiazygos vein and the accessory hemiazygos vein, when taken together, essentially serve as the left-sided equivalent of the azygos vein. [2] 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. [2]
The accessory hemiazygos vein varies inversely in size with the left superior intercostal vein. It usually receives the posterior intercostal veins from the 4th, 5th, 6th, 7th, and 8th intercostal spaces between the left superior intercostal vein and highest tributary of the hemiazygos vein; [3] the left bronchial vein sometimes opens into it.
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.
The bronchial veins are small vessels that return blood from the larger bronchi and structures at the roots of the lungs. The right side drains into the azygos vein , while the left side drains into the left superior intercostal vein or the accessory hemiazygos vein .
The aortic hiatus is a midline [1]: 185 opening in the posterior part of the diaphragm giving passage to the descending aorta as well as the thoracic duct, and variably the azygos and hemiazygos veins. [2] It is the lowest and most posterior of the large apertures. [citation needed]
The 1st and 2nd lumbar veins are often interconnected with each other. An ascending lumbar vein additionally interconnects ipsilateral lumbar veins on each side. [1]The lumbar veins communicate with the external and internal vertebral venous plexuses, and form anastomoses with tributaries of the azygos vein and hemiazygos vein (posteriorly), and (anteriorly) with branches of the epigastric ...
the azygos vein (in the case of the right ascending lumbar vein). [1] [2] the hemiazygos vein (in the case of the left ascending lumbar vein). [1] The first and second lumbar veins ends in the ascending lumbar vein(the third and fourth lumbar veins open into the posterior aspect of the inferior vena cava)
A list of veins in the human body: Veins of the heart. Coronary sinus. Great cardiac vein; Oblique vein of left atrium; Middle cardiac vein; Small cardiac vein; Pulmonary veins; Superior vena cava. Brachiocephalic vein. Inferior thyroid vein; Inferior laryngeal vein; Pericardial veins; Pericardiophrenic veins; Bronchial veins; Vertebral vein ...