Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System: Veins: Head, Neck, and Thorax
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
The hemiazygos vein usually receives the ninth to eleventh posterior intercostal veins, and may include the eighth. The hemiazygos vein passes behind the aorta from the left side to join the right-sided azygos. The communication may be doubled.
The hemiazygos veins have been found passing to the right side of the body ventral to (cross over) the aorta. In situs inversus and persistent left superior vena cava, the hemiazygos may switch sides with the azygos vein. In 40% of cases the hemiazygos is continuous above with an accessory hemiazygos vein.
The vein may open into the right atrium, brachiocephalic trunk, internal thoracic vein, left subclavian vein (ascribed to an elongated embryonic left common cardinal vein), or left brachiocephalic (after receiving abnormally the azygos vein).
Lejars found the left azygos (hemiazygos) vein communicating with the left renal vein in 88% of subjects studied.
Unusual tributaries include the superior phrenic, gonadal, renal, and suprarenal veins.
See also Azygos Vein
Left Cardinal (Persistant)
See Azygos Vein and Accessory Azygos Vein
Lejars, -. (1888) Les voies de sûreté de la veine rénale. Bull. et Mem. de la société Anatomique de Paris.
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