Accessory hemiazygos vein
Citation, DOI and article data
The accessory (or superior) hemiazygos vein forms part of the azygos system and along with the hemiazygos vein, it is partially analogous to the right-sided azygos vein. It drains the left superior hemithorax.
Spelling it "hemiazygous" when referring to the vein is incorrect, regardless of whether British or American English 5. In the context of anatomy, see Terminologia Anatomica, hemiazygos vein is the sole correct spelling.
Origin and course
The accessory hemiazygos vein is formed by the confluence of the middle left posterior intercostal veins. It descends to the left of midline, adjacent to the thoracic vertebrae and crosses posteriorly to the aorta at the level of T7-8 to drain into the azygos vein. It normally anastomoses with the left superior intercostal vein.
- left 4th-8th posterior intercostal veins
- left bronchial veins (variable)
- 1. Ryan S, McNicholas M, Eustace SJ. Anatomy for Diagnostic Imaging. Saunders Ltd. ISBN:B006L65KZ2. Read it at Google Books - Find it at Amazon
- 2. Blackmon JM, Franco A. Normal variants of the accessory hemiazygos vein. Br J Radiol. 2011;84 (1003): 659-60. doi:10.1259/bjr/13695502 - Free text at pubmed - Pubmed citation
- 3. The vein book. Academic Press. ISBN:0123695155. Read it at Google Books - Find it at Amazon
- 4. Drake R, Vogl AW, Mitchell AWM. Gray's Basic Anatomy: with STUDENT CONSULT Online Access (Grays Anatomy for Students). Churchill Livingstone. ISBN:B0092DEQ1U. Read it at Google Books - Find it at Amazon
- 5. Holemans JA. Azygos, not azygous. (2001) AJR. American journal of roentgenology. 176 (6): 1602. doi:10.2214/ajr.176.6.1761602b - Pubmed