Hemiazygos Veins and Accessory HemiAzygos Veins

Question 1

The Hemiazygos vein lies on

Answer 1

The Left side and corresponds to the lower part of azygos vein

Question 2

How is hemiazygos vein formed

Answer 2

1. Union of left ascending lumbar vein and left subcostal vein
2. It may arise from posterior surface of left renal vein

Question 3

The Course of Hemiazygos Vein

Answer 3

It pierces left crus of diaphragm and ascends vertically upwards to the level of T8 from where it turns right and crosses in front of vertebral column and posterior to aorta and thoracic duct to join the azygos vein

Question 4

The tributaries of hemiazygos vein are

Answer 4

1. Lower three (9th–11th) left posterior intercostal veins.
2. Left subcostal vein.
3. Left ascending lumbar vein.
4. Small esophageal and mediastinal veins.

Question 5

The Accessory Hemiazygos vein line on

Answer 5

The left side and corresponds to the upper part of azygos vein

Question 6

Course of Accessory HemiAzygos Vein

Answer 6

It begins at the medial end of 4th or 5th intercostal space from where it descends to the left side of vertebral column and at T8 Level it turns right in front of vertebral column and posterior to aorta and thoracic duct to merge with Azygos Vein

Question 7

The tributaries of Accessory hemiazygos vein are

Answer 7

1. Fifth to eighth (5th–8th) left posterior intercostal veins.
2. Left bronchial veins (sometimes).